Build a small animation editor prototype with a scrubbable timeline: the scene is a pure-white, hand-drawn sketch-style room viewed from a fixed 45° overhead angle. A timeline slider at the bottom can be dragged to fast-forward or rewind. Place several spheres in the scene that move along predefined trajectories; when spheres collide with each other or with the walls, play short percussive sound effects and display the “collision count” in real time in a corner of the UI. During arbitrary timeline scrubbing, positions, collisions, and audio must stay synchronized with time (collisions should not be counted more than once). The prototype should run directly in a web page, preferably using Three.js for rendering and the Web Audio API for playback.