diff --git a/packages/dataverse/src/Atom.ts b/packages/dataverse/src/Atom.ts
index b6e9b06..500bc25 100644
--- a/packages/dataverse/src/Atom.ts
+++ b/packages/dataverse/src/Atom.ts
@@ -4,10 +4,10 @@ import last from 'lodash-es/last'
 import type {Prism} from './prism/Interface'
 import {isPrism} from './prism/Interface'
 import type {Pointer, PointerType} from './pointer'
+import {getPointerParts} from './pointer'
 import {isPointer} from './pointer'
 import pointer, {getPointerMeta} from './pointer'
 import type {$FixMe, $IntentionalAny} from './types'
-import type {PathBasedReducer} from './utils/PathBasedReducer'
 import updateDeep from './utils/updateDeep'
 import prism from './prism/prism'
 
@@ -176,39 +176,22 @@ export default class Atom<State> implements IdentityPrismProvider {
     return path.length === 0 ? this.getState() : get(this.getState(), path)
   }
 
-  /**
-   * Creates a new state object from the current one, where the value at `path`
-   * is replaced by the return value of `reducer`, then sets it.
-   *
-   * @remarks
-   * Doesn't mutate the old state, and preserves referential equality between
-   * values of the old state and the new state where possible.
-   *
-   * @example
-   * ```ts
-   * someAtom.getIn(['a']) // 1
-   * someAtom.reduceState(['a'], (state) => state + 1);
-   * someAtom.getIn(['a']) // 2
-   * ```
-   *
-   * @param path - The path to call the reducer at.
-   * @param reducer - The function to use for creating the new state.
-   */
-  // TODO: Why is this a property and not a method?
-  reduceState: PathBasedReducer<State, State> = (
-    path: $IntentionalAny[],
-    reducer: $IntentionalAny,
-  ) => {
-    const newState = updateDeep(this.getState(), path, reducer)
-    this.setState(newState)
-    return newState
+  reduce(fn: (state: State) => State) {
+    this.set(fn(this.get()))
   }
 
-  /**
-   * Sets the state of the atom at `path`.
-   */
-  setIn(path: $FixMe[], val: $FixMe) {
-    return this.reduceState(path, () => val)
+  reduceByPointer<S>(
+    fn: (p: Pointer<State>) => Pointer<S>,
+    reducer: (s: S) => S,
+  ) {
+    const pointer = fn(this.pointer)
+    const path = getPointerParts(pointer).path
+    const newState = updateDeep(this.get(), path, reducer)
+    this.set(newState)
+  }
+
+  setByPointer<S>(fn: (p: Pointer<State>) => Pointer<S>, val: S) {
+    this.reduceByPointer(fn, () => val)
   }
 
   private _checkUpdates(scope: Scope, oldState: unknown, newState: unknown) {
diff --git a/packages/dataverse/src/prism/iterateOver.test.ts b/packages/dataverse/src/prism/iterateOver.test.ts
index 9bbf3d0..b81eda3 100644
--- a/packages/dataverse/src/prism/iterateOver.test.ts
+++ b/packages/dataverse/src/prism/iterateOver.test.ts
@@ -6,16 +6,16 @@ import iterateOver from './iterateOver'
 
 describe(`iterateOver()`, () => {
   test('it should work', () => {
-    const a = new Atom({a: 0})
-    let iter = iterateOver(a.pointer.a)
+    const a = new Atom(0)
+    let iter = iterateOver(a.pointer)
     expect(iter.next().value).toEqual(0)
-    a.setIn(['a'], 1)
-    a.setIn(['a'], 2)
+    a.set(1)
+    a.set(2)
     expect(iter.next()).toMatchObject({value: 2, done: false})
     iter.return()
-    iter = iterateOver(a.pointer.a)
+    iter = iterateOver(a.pointer)
     expect(iter.next().value).toEqual(2)
-    a.setIn(['a'], 3)
+    a.set(3)
     expect(iter.next()).toMatchObject({done: false, value: 3})
     iter.return()
   })
diff --git a/packages/dataverse/src/prism/prism.test.ts b/packages/dataverse/src/prism/prism.test.ts
index bb34caf..e86a76e 100644
--- a/packages/dataverse/src/prism/prism.test.ts
+++ b/packages/dataverse/src/prism/prism.test.ts
@@ -25,7 +25,7 @@ describe('prism', () => {
       changes.push(c)
     })
 
-    o.reduceState(['foo'], () => 'foo2')
+    o.reduce(({foo}) => ({foo: 'foo2'}))
     ticker.tick()
     expect(changes).toMatchObject(['foo2boo'])
   })
@@ -43,11 +43,11 @@ describe('prism', () => {
 
   describe('prism.ref()', () => {
     it('should work', () => {
-      const theAtom: Atom<{n: number}> = new Atom({n: 2})
+      const theAtom: Atom<number> = new Atom(2)
 
       const isEvenD = prism((): {isEven: boolean} => {
         const ref = prism.ref<{isEven: boolean} | undefined>('cache', undefined)
-        const currentN = val(theAtom.pointer.n)
+        const currentN = val(theAtom.pointer)
 
         const isEven = currentN % 2 === 0
         if (ref.current && ref.current.isEven === isEven) {
@@ -60,20 +60,20 @@ describe('prism', () => {
 
       const iterator = iterateAndCountTicks(isEvenD)
 
-      theAtom.reduceState(['n'], () => 3)
+      theAtom.reduce(() => 3)
 
       expect(iterator.next().value).toMatchObject({
         value: {isEven: false},
         ticks: 0,
       })
-      theAtom.reduceState(['n'], () => 5)
-      theAtom.reduceState(['n'], () => 7)
+      theAtom.reduce(() => 5)
+      theAtom.reduce(() => 7)
       expect(iterator.next().value).toMatchObject({
         value: {isEven: false},
         ticks: 1,
       })
-      theAtom.reduceState(['n'], () => 2)
-      theAtom.reduceState(['n'], () => 4)
+      theAtom.reduce(() => 2)
+      theAtom.reduce(() => 4)
       expect(iterator.next().value).toMatchObject({
         value: {isEven: true},
         ticks: 1,
@@ -91,10 +91,10 @@ describe('prism', () => {
       const sequence: unknown[] = []
       let deps: unknown[] = []
 
-      const a = new Atom({letter: 'a'})
+      const a = new Atom('a')
 
       const prsm = prism(() => {
-        const n = val(a.pointer.letter)
+        const n = val(a.pointer)
         const iterationAtTimeOfCall = iteration
         sequence.push({prismCall: iterationAtTimeOfCall})
 
@@ -120,14 +120,14 @@ describe('prism', () => {
       sequence.length = 0
 
       iteration++
-      a.setIn(['letter'], 'b')
+      a.set('b')
       ticker.tick()
       expect(sequence).toMatchObject([{prismCall: 1}, {change: 'b'}])
       sequence.length = 0
 
       deps = [1]
       iteration++
-      a.setIn(['letter'], 'c')
+      a.set('c')
       ticker.tick()
       expect(sequence).toMatchObject([
         {prismCall: 2},
@@ -151,10 +151,10 @@ describe('prism', () => {
       const sequence: unknown[] = []
       let deps: unknown[] = []
 
-      const a = new Atom({letter: 'a'})
+      const a = new Atom('a')
 
       const prsm = prism(() => {
-        const n = val(a.pointer.letter)
+        const n = val(a.pointer)
         const iterationAtTimeOfCall = iteration
         sequence.push({prismCall: iterationAtTimeOfCall})
 
@@ -184,7 +184,7 @@ describe('prism', () => {
       sequence.length = 0
 
       iteration++
-      a.setIn(['letter'], 'b')
+      a.set('b')
       ticker.tick()
       expect(sequence).toMatchObject([
         {prismCall: 1},
@@ -195,7 +195,7 @@ describe('prism', () => {
 
       deps = [1]
       iteration++
-      a.setIn(['letter'], 'c')
+      a.set('c')
       ticker.tick()
       expect(sequence).toMatchObject([
         {prismCall: 2},
diff --git a/packages/dataverse/src/utils/PathBasedReducer.ts b/packages/dataverse/src/utils/PathBasedReducer.ts
deleted file mode 100644
index b3380de..0000000
--- a/packages/dataverse/src/utils/PathBasedReducer.ts
+++ /dev/null
@@ -1,133 +0,0 @@
-export type PathBasedReducer<S, ReturnType> = {
-  <
-    A0 extends keyof S,
-    A1 extends keyof S[A0],
-    A2 extends keyof S[A0][A1],
-    A3 extends keyof S[A0][A1][A2],
-    A4 extends keyof S[A0][A1][A2][A3],
-    A5 extends keyof S[A0][A1][A2][A3][A4],
-    A6 extends keyof S[A0][A1][A2][A3][A4][A5],
-    A7 extends keyof S[A0][A1][A2][A3][A4][A5][A6],
-    A8 extends keyof S[A0][A1][A2][A3][A4][A5][A6][A7],
-    A9 extends keyof S[A0][A1][A2][A3][A4][A5][A6][A7][A8],
-    A10 extends keyof S[A0][A1][A2][A3][A4][A5][A6][A7][A8][A9],
-  >(
-    addr: [A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10],
-    reducer: (
-      d: S[A0][A1][A2][A3][A4][A5][A6][A7][A8][A9][A10],
-    ) => S[A0][A1][A2][A3][A4][A5][A6][A7][A8][A9][A10],
-  ): ReturnType
-
-  <
-    A0 extends keyof S,
-    A1 extends keyof S[A0],
-    A2 extends keyof S[A0][A1],
-    A3 extends keyof S[A0][A1][A2],
-    A4 extends keyof S[A0][A1][A2][A3],
-    A5 extends keyof S[A0][A1][A2][A3][A4],
-    A6 extends keyof S[A0][A1][A2][A3][A4][A5],
-    A7 extends keyof S[A0][A1][A2][A3][A4][A5][A6],
-    A8 extends keyof S[A0][A1][A2][A3][A4][A5][A6][A7],
-    A9 extends keyof S[A0][A1][A2][A3][A4][A5][A6][A7][A8],
-  >(
-    addr: [A0, A1, A2, A3, A4, A5, A6, A7, A8, A9],
-    reducer: (
-      d: S[A0][A1][A2][A3][A4][A5][A6][A7][A8][A9],
-    ) => S[A0][A1][A2][A3][A4][A5][A6][A7][A8][A9],
-  ): ReturnType
-
-  <
-    A0 extends keyof S,
-    A1 extends keyof S[A0],
-    A2 extends keyof S[A0][A1],
-    A3 extends keyof S[A0][A1][A2],
-    A4 extends keyof S[A0][A1][A2][A3],
-    A5 extends keyof S[A0][A1][A2][A3][A4],
-    A6 extends keyof S[A0][A1][A2][A3][A4][A5],
-    A7 extends keyof S[A0][A1][A2][A3][A4][A5][A6],
-    A8 extends keyof S[A0][A1][A2][A3][A4][A5][A6][A7],
-  >(
-    addr: [A0, A1, A2, A3, A4, A5, A6, A7, A8],
-    reducer: (
-      d: S[A0][A1][A2][A3][A4][A5][A6][A7][A8],
-    ) => S[A0][A1][A2][A3][A4][A5][A6][A7][A8],
-  ): ReturnType
-
-  <
-    A0 extends keyof S,
-    A1 extends keyof S[A0],
-    A2 extends keyof S[A0][A1],
-    A3 extends keyof S[A0][A1][A2],
-    A4 extends keyof S[A0][A1][A2][A3],
-    A5 extends keyof S[A0][A1][A2][A3][A4],
-    A6 extends keyof S[A0][A1][A2][A3][A4][A5],
-    A7 extends keyof S[A0][A1][A2][A3][A4][A5][A6],
-  >(
-    addr: [A0, A1, A2, A3, A4, A5, A6, A7],
-    reducer: (
-      d: S[A0][A1][A2][A3][A4][A5][A6][A7],
-    ) => S[A0][A1][A2][A3][A4][A5][A6][A7],
-  ): ReturnType
-
-  <
-    A0 extends keyof S,
-    A1 extends keyof S[A0],
-    A2 extends keyof S[A0][A1],
-    A3 extends keyof S[A0][A1][A2],
-    A4 extends keyof S[A0][A1][A2][A3],
-    A5 extends keyof S[A0][A1][A2][A3][A4],
-    A6 extends keyof S[A0][A1][A2][A3][A4][A5],
-  >(
-    addr: [A0, A1, A2, A3, A4, A5, A6],
-    reducer: (
-      d: S[A0][A1][A2][A3][A4][A5][A6],
-    ) => S[A0][A1][A2][A3][A4][A5][A6],
-  ): ReturnType
-
-  <
-    A0 extends keyof S,
-    A1 extends keyof S[A0],
-    A2 extends keyof S[A0][A1],
-    A3 extends keyof S[A0][A1][A2],
-    A4 extends keyof S[A0][A1][A2][A3],
-    A5 extends keyof S[A0][A1][A2][A3][A4],
-  >(
-    addr: [A0, A1, A2, A3, A4, A5],
-    reducer: (d: S[A0][A1][A2][A3][A4][A5]) => S[A0][A1][A2][A3][A4][A5],
-  ): ReturnType
-
-  <
-    A0 extends keyof S,
-    A1 extends keyof S[A0],
-    A2 extends keyof S[A0][A1],
-    A3 extends keyof S[A0][A1][A2],
-    A4 extends keyof S[A0][A1][A2][A3],
-  >(
-    addr: [A0, A1, A2, A3, A4],
-    reducer: (d: S[A0][A1][A2][A3][A4]) => S[A0][A1][A2][A3][A4],
-  ): ReturnType
-
-  <
-    A0 extends keyof S,
-    A1 extends keyof S[A0],
-    A2 extends keyof S[A0][A1],
-    A3 extends keyof S[A0][A1][A2],
-  >(
-    addr: [A0, A1, A2, A3],
-    reducer: (d: S[A0][A1][A2][A3]) => S[A0][A1][A2][A3],
-  ): ReturnType
-
-  <A0 extends keyof S, A1 extends keyof S[A0], A2 extends keyof S[A0][A1]>(
-    addr: [A0, A1, A2],
-    reducer: (d: S[A0][A1][A2]) => S[A0][A1][A2],
-  ): ReturnType
-
-  <A0 extends keyof S, A1 extends keyof S[A0]>(
-    addr: [A0, A1],
-    reducer: (d: S[A0][A1]) => S[A0][A1],
-  ): ReturnType
-
-  <A0 extends keyof S>(addr: [A0], reducer: (d: S[A0]) => S[A0]): ReturnType
-
-  (addr: undefined[], reducer: (d: S) => S): ReturnType
-}
diff --git a/theatre/core/src/projects/Project.ts b/theatre/core/src/projects/Project.ts
index c583e88..1b0e5c1 100644
--- a/theatre/core/src/projects/Project.ts
+++ b/theatre/core/src/projects/Project.ts
@@ -240,11 +240,11 @@ export default class Project {
     sheetId: SheetId,
     instanceId: SheetInstanceId = 'default' as SheetInstanceId,
   ): Sheet {
-    let template = this._sheetTemplates.getState()[sheetId]
+    let template = this._sheetTemplates.get()[sheetId]
 
     if (!template) {
       template = new SheetTemplate(this, sheetId)
-      this._sheetTemplates.setIn([sheetId], template)
+      this._sheetTemplates.reduce((s) => ({...s, [sheetId]: template}))
     }
 
     return template.getInstance(instanceId)
diff --git a/theatre/core/src/projects/projectsSingleton.ts b/theatre/core/src/projects/projectsSingleton.ts
index 8999632..82dbf58 100644
--- a/theatre/core/src/projects/projectsSingleton.ts
+++ b/theatre/core/src/projects/projectsSingleton.ts
@@ -14,11 +14,11 @@ class ProjectsSingleton {
    * We're trusting here that each project id is unique
    */
   add(id: ProjectId, project: Project) {
-    this.atom.reduceState(['projects', id], () => project)
+    this.atom.setByPointer((p) => p.projects[id], project)
   }
 
   get(id: ProjectId): Project | undefined {
-    return this.atom.getState().projects[id]
+    return this.atom.get().projects[id]
   }
 
   has(id: ProjectId) {
diff --git a/theatre/core/src/sequences/playbackControllers/AudioPlaybackController.ts b/theatre/core/src/sequences/playbackControllers/AudioPlaybackController.ts
index 23a020d..138a318 100644
--- a/theatre/core/src/sequences/playbackControllers/AudioPlaybackController.ts
+++ b/theatre/core/src/sequences/playbackControllers/AudioPlaybackController.ts
@@ -120,11 +120,11 @@ export default class AudioPlaybackController implements IPlaybackController {
   }
 
   private get _playing() {
-    return this._state.getState().playing
+    return this._state.get().playing
   }
 
   private set _playing(playing: boolean) {
-    this._state.setIn(['playing'], playing)
+    this._state.setByPointer((p) => p.playing, playing)
   }
 
   destroy() {}
@@ -140,11 +140,11 @@ export default class AudioPlaybackController implements IPlaybackController {
   }
 
   private _updatePositionInState(time: number) {
-    this._state.reduceState(['position'], () => time)
+    this._state.reduce((s) => ({...s, position: time}))
   }
 
   getCurrentPosition() {
-    return this._state.getState().position
+    return this._state.get().position
   }
 
   play(
diff --git a/theatre/core/src/sequences/playbackControllers/DefaultPlaybackController.ts b/theatre/core/src/sequences/playbackControllers/DefaultPlaybackController.ts
index 11a8835..51fdf1c 100644
--- a/theatre/core/src/sequences/playbackControllers/DefaultPlaybackController.ts
+++ b/theatre/core/src/sequences/playbackControllers/DefaultPlaybackController.ts
@@ -66,19 +66,19 @@ export default class DefaultPlaybackController implements IPlaybackController {
   }
 
   private _updatePositionInState(time: number) {
-    this._state.reduceState(['position'], () => time)
+    this._state.setByPointer((p) => p.position, time)
   }
 
   getCurrentPosition() {
-    return this._state.getState().position
+    return this._state.get().position
   }
 
   get playing() {
-    return this._state.getState().playing
+    return this._state.get().playing
   }
 
   set playing(playing: boolean) {
-    this._state.setIn(['playing'], playing)
+    this._state.setByPointer((p) => p.playing, playing)
   }
 
   play(
diff --git a/theatre/core/src/sheetObjects/SheetObject.ts b/theatre/core/src/sheetObjects/SheetObject.ts
index ee21417..cd82ea8 100644
--- a/theatre/core/src/sheetObjects/SheetObject.ts
+++ b/theatre/core/src/sheetObjects/SheetObject.ts
@@ -256,7 +256,11 @@ export default class SheetObject implements IdentityPrismProvider {
             const updateSequenceValueFromItsPrism = () => {
               const triple = pr.getValue()
 
-              if (!triple) return valsAtom.setIn(pathToProp, undefined)
+              if (!triple)
+                return valsAtom.setByPointer(
+                  (p) => pointerDeep(p, pathToProp),
+                  undefined,
+                )
 
               const leftDeserialized = deserializeAndSanitize(triple.left)
 
@@ -266,7 +270,10 @@ export default class SheetObject implements IdentityPrismProvider {
                   : leftDeserialized
 
               if (triple.right === undefined)
-                return valsAtom.setIn(pathToProp, left)
+                return valsAtom.setByPointer(
+                  (p) => pointerDeep(p, pathToProp),
+                  left,
+                )
 
               const rightDeserialized = deserializeAndSanitize(triple.right)
               const right =
@@ -274,8 +281,8 @@ export default class SheetObject implements IdentityPrismProvider {
                   ? propConfig.default
                   : rightDeserialized
 
-              return valsAtom.setIn(
-                pathToProp,
+              return valsAtom.setByPointer(
+                (p) => pointerDeep(p, pathToProp),
                 interpolate(left, right, triple.progression),
               )
             }
diff --git a/theatre/core/src/sheets/Sheet.ts b/theatre/core/src/sheets/Sheet.ts
index d5943c2..49cbc15 100644
--- a/theatre/core/src/sheets/Sheet.ts
+++ b/theatre/core/src/sheets/Sheet.ts
@@ -69,7 +69,7 @@ export default class Sheet {
 
     const object = objTemplate.createInstance(this, nativeObject, config)
 
-    this._objects.setIn([objectKey], object)
+    this._objects.setByPointer((p) => p[objectKey], object)
 
     return object
   }
@@ -79,7 +79,7 @@ export default class Sheet {
   }
 
   deleteObject(objectKey: ObjectAddressKey) {
-    this._objects.reduceState([], (state) => {
+    this._objects.reduce((state) => {
       const newState = {...state}
       delete newState[objectKey]
       return newState
diff --git a/theatre/core/src/sheets/SheetTemplate.ts b/theatre/core/src/sheets/SheetTemplate.ts
index 680cae7..3712b1f 100644
--- a/theatre/core/src/sheets/SheetTemplate.ts
+++ b/theatre/core/src/sheets/SheetTemplate.ts
@@ -43,7 +43,7 @@ export default class SheetTemplate {
 
     if (!inst) {
       inst = new Sheet(this, instanceId)
-      this._instances.setIn([instanceId], inst)
+      this._instances.setByPointer((p) => p[instanceId], inst)
     }
 
     return inst
@@ -65,7 +65,7 @@ export default class SheetTemplate {
         config,
         actions,
       )
-      this._objectTemplates.setIn([objectKey], template)
+      this._objectTemplates.setByPointer((p) => p[objectKey], template)
     }
 
     return template
diff --git a/theatre/studio/src/Studio.ts b/theatre/studio/src/Studio.ts
index e2cd5a7..d3aa260 100644
--- a/theatre/studio/src/Studio.ts
+++ b/theatre/studio/src/Studio.ts
@@ -188,7 +188,7 @@ export class Studio {
 
   setCoreBits(coreBits: CoreBits) {
     this._corePrivateApi = coreBits.privateAPI
-    this._coreAtom.setIn(['core'], coreBits.coreExports)
+    this._coreAtom.setByPointer((p) => p.core, coreBits.coreExports)
     this._setProjectsP(coreBits.projectsP)
   }
 
diff --git a/theatre/studio/src/panels/SequenceEditorPanel/FrameStampPositionProvider.tsx b/theatre/studio/src/panels/SequenceEditorPanel/FrameStampPositionProvider.tsx
index 0a21482..ca91a9e 100644
--- a/theatre/studio/src/panels/SequenceEditorPanel/FrameStampPositionProvider.tsx
+++ b/theatre/studio/src/panels/SequenceEditorPanel/FrameStampPositionProvider.tsx
@@ -49,7 +49,7 @@ let lastLockId = 0
 const FrameStampPositionProvider: React.FC<{
   layoutP: Pointer<SequenceEditorPanelLayout>
 }> = ({children, layoutP}) => {
-  const locksAtom = useMemo(() => new Atom<{list: LockItem[]}>({list: []}), [])
+  const locksAtom = useMemo(() => new Atom<LockItem[]>([]), [])
   const currentD = useMemo(
     () =>
       prism(() => {
@@ -57,7 +57,7 @@ const FrameStampPositionProvider: React.FC<{
           .memo('p', () => pointerPositionInUnitSpace(layoutP), [layoutP])
           .getValue()
 
-        const locks = val(locksAtom.pointer.list)
+        const locks = val(locksAtom.pointer)
 
         if (locks.length > 0) {
           return last(locks)!.position
@@ -69,7 +69,7 @@ const FrameStampPositionProvider: React.FC<{
   )
   const getLock = useCallback(() => {
     const id = lastLockId++
-    locksAtom.reduceState(['list'], (list) => [
+    locksAtom.reduce((list) => [
       ...list,
       {
         id,
@@ -78,13 +78,11 @@ const FrameStampPositionProvider: React.FC<{
     ])
 
     const unlock = () => {
-      locksAtom.reduceState(['list'], (list) =>
-        list.filter((lock) => lock.id !== id),
-      )
+      locksAtom.reduce((list) => list.filter((lock) => lock.id !== id))
     }
 
     const set = (posInUnitSpace: number) => {
-      locksAtom.reduceState(['list'], (list) => {
+      locksAtom.reduce((list) => {
         const index = list.findIndex((lock) => lock.id === id)
         if (index === -1) {
           console.warn(`Lock is already freed. This is a bug.`)
diff --git a/theatre/studio/src/uiComponents/usePresence.tsx b/theatre/studio/src/uiComponents/usePresence.tsx
index 609aeb6..c908d05 100644
--- a/theatre/studio/src/uiComponents/usePresence.tsx
+++ b/theatre/studio/src/uiComponents/usePresence.tsx
@@ -7,6 +7,7 @@ import {prism, pointerToPrism} from '@theatre/dataverse'
 import {Atom} from '@theatre/dataverse'
 import {usePrismInstance} from '@theatre/react'
 import {selectClosestHTMLAncestor} from '@theatre/studio/utils/selectClosestHTMLAncestor'
+import pointerDeep from '@theatre/shared/utils/pointerDeep'
 
 /** To mean the presence value */
 export enum PresenceFlag {
@@ -53,12 +54,15 @@ function createPresenceContext(options: {
           flag: rel.flag,
         }
         const path = [rel.affects, itemKey, relationId]
-        relationsAtom.setIn(path, presence)
+        relationsAtom.setByPointer((p) => pointerDeep(p, path), presence)
         return path
       })
       return () => {
         for (const pathToUndo of undoAtPaths) {
-          relationsAtom.setIn(pathToUndo, undefined)
+          relationsAtom.setByPointer(
+            (p) => pointerDeep(p, pathToUndo),
+            undefined,
+          )
         }
       }
     },
@@ -98,16 +102,16 @@ function createPresenceContext(options: {
       return usePrismInstance(focusD)
     },
     setUserHover(itemKeyOpt) {
-      const prev = currentUserHoverItemB.getState()
+      const prev = currentUserHoverItemB.get()
       if (prev === itemKeyOpt) {
         return
       }
       if (prev) {
-        currentUserHoverFlagItemsAtom.setIn([prev], false)
+        currentUserHoverFlagItemsAtom.setByPointer((p) => p[prev], false)
       }
-      currentUserHoverItemB.setState(itemKeyOpt)
+      currentUserHoverItemB.set(itemKeyOpt)
       if (itemKeyOpt) {
-        currentUserHoverFlagItemsAtom.setIn([itemKeyOpt], true)
+        currentUserHoverFlagItemsAtom.setByPointer((p) => p[itemKeyOpt], true)
       }
     },
   }
diff --git a/theatre/studio/src/utils/renderInPortalInContext.tsx b/theatre/studio/src/utils/renderInPortalInContext.tsx
index 332d2cb..7bce0c7 100644
--- a/theatre/studio/src/utils/renderInPortalInContext.tsx
+++ b/theatre/studio/src/utils/renderInPortalInContext.tsx
@@ -27,7 +27,7 @@ export const getMounter = () => {
     props: Props,
     portalNode: HTMLElement,
   ) {
-    theAtom.reduceState([], (s) => {
+    theAtom.reduce((s) => {
       return {
         byId: {...s.byId, [id]: {comp, props, portalNode}},
         set: {...s.set, [id]: true},
@@ -36,7 +36,7 @@ export const getMounter = () => {
   }
 
   function unmount() {
-    theAtom.reduceState([], (s) => {
+    theAtom.reduce((s) => {
       const set = {...s.set}
       const byId = {...s.byId}
       delete set[id]