diff --git a/src/components/function_box.tsx b/src/components/function_box.tsx
new file mode 100644
index 0000000..3c65062
--- /dev/null
+++ b/src/components/function_box.tsx
@@ -0,0 +1,290 @@
+import {
+  Img,
+  Rect,
+  Node,
+  Video,
+  makeScene2D,
+  Txt,
+  Line,
+  LineSegment,
+  NodeProps,
+} from "@motion-canvas/2d";
+import {
+  Direction,
+  beginSlide,
+  createRef,
+  map,
+  slideTransition,
+  tween,
+  all,
+  waitFor,
+  range,
+  makeRef,
+} from "@motion-canvas/core";
+
+import { CodeBlock } from "@motion-canvas/2d/lib/components/CodeBlock";
+import { theme } from "../theme";
+
+import * as ts from "typescript";
+
+export interface FunctionBoxProps extends NodeProps {
+  source?: string;
+  fn?: Function;
+  padding?: number;
+  delta?: number;
+
+  workingText?: string;
+  idlingText?: string;
+
+  arity?: number;
+
+  isChild?: boolean;
+}
+
+type FunctionArgs = { node?: Node; val: any }[];
+
+/*
+<Node ref={this.node} opacity={0}>
+            <CodeBlock
+              fontFamily={theme.font}
+              language="typescript"
+              ref={this.block}
+              fontSize={1}
+              code={this.source}
+            ></CodeBlock>
+          </Node>
+ */
+
+export class FunctionBox extends Node {
+  private readonly source: string;
+  private readonly workingText: string;
+  private readonly idlingText: string;
+  private readonly function: any;
+  private readonly delta: number;
+  private readonly arity: number;
+  private readonly padding: number;
+
+  private readonly block = createRef<CodeBlock>();
+  private readonly node = createRef<Node>();
+  private readonly rect = createRef<Rect>();
+
+  private readonly boxMoji = createRef<Txt>();
+  private readonly inputSegments: Line[] = [];
+  private readonly inputs: Rect[] = [];
+  private readonly outputSegment = createRef<Line>();
+  private readonly output = createRef<Node>();
+  private readonly child = createRef<FunctionBox>();
+
+  private readonly isChild: boolean;
+
+  private currentArgs: FunctionArgs = [];
+
+  public constructor(props?: FunctionBoxProps) {
+    super({
+      ...props,
+    });
+
+    this.arity = props?.arity ?? 1;
+    if (props.fn) {
+      this.source = props.fn.toString();
+      this.function = props.fn;
+    } else {
+      this.source = props?.source ?? `(x: number): number => x + 2`;
+
+      const functionCode = ts.transpile(this.source);
+      this.function = eval(functionCode);
+    }
+
+    this.delta = props?.delta ?? 20;
+    this.padding = props?.padding ?? 100;
+
+    this.workingText = props?.workingText ?? "👷‍♀️⚙️";
+    this.idlingText = props?.idlingText ?? "😴";
+
+    this.isChild = props?.isChild ?? false;
+
+    this.add(
+      <Rect
+        opacity={this.opacity}
+        direction={"row"}
+        alignItems={"center"}
+        layout
+      >
+        <Rect direction={"column"} alignItems={"end"}>
+          {range(this.arity).map((i) => (
+            <Rect direction={"row"} alignItems={"center"} gap={10}>
+              <Rect
+                direction={"row"}
+                ref={makeRef(this.inputs, i)}
+                justifyContent={"end"}
+                opacity={1}
+              ></Rect>
+
+              <Line
+                points={[]}
+                stroke={theme.green.hex}
+                ref={makeRef(this.inputSegments, i)}
+                lineWidth={5}
+                arrowSize={10}
+                endArrow
+              ></Line>
+            </Rect>
+          ))}
+        </Rect>
+
+        <Rect
+          ref={this.rect}
+          radius={4}
+          stroke={theme.overlay0.hex}
+          fill={theme.crust.hex}
+          lineWidth={4}
+          padding={60}
+          direction={"row"}
+          height={"100%"}
+          gap={40}
+        >
+          <Txt fontFamily={theme.font} fill={theme.text.hex} ref={this.boxMoji}>
+            {this.idlingText}
+          </Txt>
+        </Rect>
+
+        <Rect direction={"column"} height={"100%"} alignItems={"end"}>
+          <Rect direction={"row"} alignItems={"center"} gap={10}>
+            <Line
+              points={[]}
+              stroke={theme.red.hex}
+              lineWidth={5}
+              arrowSize={10}
+              ref={this.outputSegment}
+              endArrow
+            ></Line>
+            <Rect
+              direction={"row"}
+              ref={this.output}
+              justifyContent={"end"}
+              opacity={1}
+            ></Rect>
+          </Rect>
+        </Rect>
+      </Rect>,
+    );
+  }
+
+  public *resetInput(duration: number) {
+    yield* all(
+      ...this.inputs.map((x) =>
+        all(
+          x.opacity(0, duration),
+          x.height(0, duration),
+          x.width(0, duration),
+        ),
+      ),
+      ...this.inputSegments.map((segment) => segment.points([], duration)),
+    );
+  }
+
+  public *resetOutput(duration: number) {
+    yield* all(
+      this.output().opacity(0, duration),
+      this.outputSegment().points([], duration),
+    );
+    yield this.output().removeChildren();
+  }
+
+  public *reset(duration: number) {
+    yield* all(this.resetInput(duration), this.resetOutput(duration));
+  }
+
+  public *setInputs(args: FunctionArgs, duration: number) {
+    if (args.length != this.arity)
+      throw new Error("input length must equal function arity");
+    this.currentArgs = args;
+
+    this.inputs.forEach((input, i) => {
+      input.removeChildren();
+      input.add(
+        args[i].node ?? (
+          <Txt fontFamily={theme.font} fontSize={30} fill={theme.text.hex}>
+            {args[i].val.toString()}
+          </Txt>
+        ),
+      );
+    });
+    yield* all(
+      ...this.inputSegments.map((segment) =>
+        segment.points(
+          [
+            { x: -this.padding, y: 0 },
+            { x: -this.delta, y: 0 },
+          ],
+          duration,
+        ),
+      ),
+      ...this.inputs.map((input) =>
+        all(
+          input.height(40, duration),
+          input.width(40, duration),
+          input.opacity(1, duration),
+        ),
+      ),
+    );
+  }
+
+  public *propogateInput(duration: number) {
+    const opacityChangeDuration = 0.1;
+
+    yield* all(
+      ...this.inputSegments.map((segment) =>
+        segment.opacity(0.2, opacityChangeDuration),
+      ),
+    );
+
+    yield* all(
+      ...this.inputSegments.map((segment) => segment.points([], duration)),
+    );
+
+    yield* all(
+      ...this.inputSegments.map((segment) =>
+        segment.opacity(1, opacityChangeDuration),
+      ),
+      ...this.inputs.map((input) => input.opacity(0, opacityChangeDuration)),
+      this.boxMoji().text(this.workingText, duration),
+    );
+  }
+
+  public *propogateOutput(duration: number) {
+    const opacityChangeDuration = 0.1;
+
+    const output = this.function(...this.currentArgs.map((input) => input.val));
+    if (typeof output === "function") {
+      yield this.output().add(
+        <FunctionBox
+          opacity={0}
+          isChild={true}
+          ref={this.child}
+          fn={output}
+        ></FunctionBox>,
+      );
+    } else {
+      yield this.output().add(
+        <Txt fontFamily={theme.font} fontSize={30} fill={theme.text.hex}>
+          {output.toString()}
+        </Txt>,
+      );
+    }
+
+    yield* all(
+      this.boxMoji().text(this.idlingText, duration),
+      this.outputSegment().points(
+        [
+          { x: -this.delta, y: 0 },
+          { x: this.padding, y: 0 },
+        ],
+        duration,
+      ),
+      this.child()?.opacity(1, duration),
+      this.output().opacity(1, duration),
+      this.outputSegment().opacity(1, duration),
+    );
+  }
+}
diff --git a/src/scenes/doctor.tsx b/src/scenes/doctor.tsx
index 642b83e..4b6c483 100644
--- a/src/scenes/doctor.tsx
+++ b/src/scenes/doctor.tsx
@@ -1,10 +1,9 @@
-import { Txt, makeScene2D } from "@motion-canvas/2d";
+import { makeScene2D } from "@motion-canvas/2d";
 import {
   Direction,
   beginSlide,
   createRef,
   slideTransition,
-  waitFor,
 } from "@motion-canvas/core";
 import { CodeBlock, insert } from "@motion-canvas/2d/lib/components/CodeBlock";
 import { theme } from "../theme";
diff --git a/src/scenes/first_box.tsx b/src/scenes/first_box.tsx
index 4927157..5508a41 100644
--- a/src/scenes/first_box.tsx
+++ b/src/scenes/first_box.tsx
@@ -1,156 +1,45 @@
-import {
-  Img,
-  Rect,
-  Node,
-  Video,
-  makeScene2D,
-  Txt,
-  Line,
-  LineSegment,
-} from "@motion-canvas/2d";
+import { makeScene2D } from "@motion-canvas/2d";
 import {
   Direction,
   beginSlide,
   createRef,
-  map,
   slideTransition,
-  tween,
   all,
   waitFor,
 } from "@motion-canvas/core";
 
-import { CodeBlock } from "@motion-canvas/2d/lib/components/CodeBlock";
-import { theme } from "../theme";
+import { FunctionBox } from "../components/function_box";
 
-const fibonacciFn = (n: number): number => {
-  if (n <= 2) {
-    return 1;
-  }
-  return fibonacciFn(n - 1) + fibonacciFn(n - 2);
-};
-
-const fibonacci = `
-const fibonacci = (n: number): number => {
-  if (n <= 2) {
-    return 1;
-  }
-  return fibonacci(n - 1) + fibonacci(n - 2);
-};
-`
-  .split("\n")
-  .filter((x) => x.trim())
-  .join("\n");
+const add = `(a: number, b: number) => {
+  return a + b;
+}`;
 
 export default makeScene2D(function* (view) {
-  const block = createRef<CodeBlock>();
-  const node = createRef<Node>();
-  const rect = createRef<Rect>();
+  const functionBox = createRef<FunctionBox>();
 
-  const boxMoji = createRef<Txt>();
-  const inSegment = createRef<Line>();
-  const outSegment = createRef<Line>();
-  const input = createRef<Txt>();
-  const output = createRef<Txt>();
+  view.add(<FunctionBox arity={2} source={add} ref={functionBox} />);
 
-  yield* view.add(
-    <>
-      <Rect
-        ref={rect}
-        radius={4}
-        stroke={theme.overlay0.hex}
-        fill={theme.crust.hex}
-        lineWidth={4}
-        padding={60}
-        layout
-      >
-        <Node ref={node} opacity={0}>
-          <CodeBlock
-            fontFamily={theme.font}
-            language="typescript"
-            ref={block}
-            fontSize={1}
-            code={fibonacci}
-          ></CodeBlock>
-        </Node>
-      </Rect>
-      <Txt fontFamily={theme.font} fill={theme.text.hex} ref={boxMoji}>
-        😴
-      </Txt>
-      <Line
-        points={[]}
-        ref={inSegment}
-        stroke={theme.green.hex}
-        lineWidth={8}
-        radius={40}
-        endArrow
-      ></Line>
-      <Line
-        points={[]}
-        ref={outSegment}
-        stroke={theme.red.hex}
-        lineWidth={8}
-        radius={40}
-        endArrow
-      ></Line>
-      <Txt
-        opacity={0}
-        fontFamily={theme.font}
-        fill={theme.text.hex}
-        ref={input}
-      ></Txt>
-      <Txt
-        opacity={0}
-        fontFamily={theme.font}
-        fill={theme.text.hex}
-        ref={output}
-      ></Txt>
-    </>,
-  );
-
-  yield boxMoji().position(rect().middle());
   yield* slideTransition(Direction.Left);
 
   yield* beginSlide("Black Box");
 
-  const padding = 100;
-  const left = rect().left();
-  const right = rect().right();
-  yield* all(
-    inSegment().points([left.addX(-padding), left], 0.5),
-    outSegment().points([right, right.addX(padding)], 0.5),
-  );
-  yield input().position(left.addX(-padding));
-  yield output().position(right);
-  for (const i of [1, 2, 3]) {
-    yield* all(
-      input().opacity(1, 0.5),
-      input().text(i.toString(), 0.5),
-      input().position(left.addX(-padding - 20), 0.5),
-    );
+  for (const [a, b] of [
+    [-1, 2],
+    [3, 4],
+    [5, 6],
+  ] as [number, number][]) {
+    const inputId = "(" + [a, b].join(",") + ")";
 
-    yield* beginSlide("Input " + i);
+    yield* all(functionBox().reset(0.25));
+    yield* functionBox().setInputs([{ val: a }, { val: b }], 0.5);
 
-    yield* input().position(left, 0.5);
-    yield* all(input().opacity(0, 0.2), boxMoji().text("👷‍♀️⚙️", 0.2));
-    yield* waitFor(0.5);
+    yield* beginSlide("Add Inputs " + inputId);
 
-    const result = fibonacciFn(i);
-    yield* all(
-      output().opacity(1, 0.5),
-      output().text(result.toString(), 0.5),
-      output().position(right, 0.5),
-    );
+    yield* functionBox().propogateInput(0.5);
+    yield* waitFor(0.3);
+    yield* functionBox().propogateOutput(0.5);
 
-    yield* all(boxMoji().text("😴", 0.2));
-
-    yield* beginSlide("Output " + i);
+    yield* beginSlide("Propogate Outputs of " + inputId);
+    yield* beginSlide("Propogate Outputs of 1" + inputId);
   }
-
-  yield* all(
-    boxMoji().opacity(0, 0.2),
-    block().fontSize(30, 1),
-    node().opacity(1, 1),
-  );
-
-  yield* beginSlide("Revealing");
 });