A mirror

This is a mirror. A. mirror. Use it yourself on codepen: https://codepen.io/JennyKowalski/full/yLBxNwW

Based on Daniel Shiffman's Checkbox Mirror from the coding train: https://www.youtube.com/watch?v=m1G6WBvrOBE and inspired by Jiwon Shin's ITP Camp 2019 session: https://itp.nyu.edu/camp2019/session/302