Rectangle Dimensions on a Blackboard

Overview

A minimalist animation that introduces a rectangle whose width is $23-2x$ and height is $x$. The rectangle is drawn in a hand‑written white style on a solid black background, with handwritten arrows and labels indicating the dimensions. The viewer sees a slow zoom‑in to emphasize the algebraic expressions.

Phases

#	Phase Name	Duration	Description
1	Fade‑in & Rectangle	~4 s	Black screen fades from darkness, then a white hand‑drawn rectangle appears centered, its sides initially invisible and then traced out.
2	Dimension Labels	~8 s	White handwritten arrows are drawn along the top and left edges; the top arrow is labeled $23-2x$ (width) and the left arrow is labeled $x$ (height). Small handwritten “width” and “height” texts appear near the arrows.
3	Slow Zoom	~6 s	The camera performs a gentle, steady zoom toward the rectangle while keeping it centered, giving a feeling of approaching a digital blackboard.
4	Fade‑out	~2 s	The scene fades to black, ending the clip.

Total ~20 s

Layout

┌─────────────────────────────────────────────┐
│                                             │
│                MAIN (rectangle)            │
│                                             │
├─────────────────────────────────────────────┤
│   caption: “Rectangle: width = 23‑2x, height = x”   │
└─────────────────────────────────────────────┘

Area Descriptions

Area	Content	Notes
Main	Hand‑drawn white rectangle with handwritten arrows and dimension labels	Central focus; occupies most of the frame
Caption	Small handwritten text summarising the dimensions	Optional; appears in footer, fades with scene

Notes

• Style assumptions: “hand‑drawn” is achieved with a rough stroke and a handwriting‑like font for the labels.
• Camera: a slow linear zoom; no pan needed.
• Color: pure black background (#000000) and pure white elements (#FFFFFF).
• No extra decorations: keep composition clean, no axes or grids.
• Duration kept under 30 seconds as required.