Double pendulums with rainbow colors.
Author shares some technical details:
The bot uses a Python script to generate a randomized instance of some double pendulums via a p5.js sketch, and then records 900 frames of the animation (which is 15 seconds when played at 60fps) with CCapture.js before FFmpeg exports it into an MP4 file. Once I have the video, twython tweets with a caption of the parameters used in the pendulums.
Since I want to run this program regularly (every 12 hours), I made a task in Task Scheduler that opens the Python script at regular intervals, automatically generating and tweeting a video.