Code kata, go write a console fish tank.
emoji_fish = [
"🐠", "🐟",
"🐡", "🐙", "🦑",
"🦐", "🦞", "🦀"
]
It is just a random walker with a visualizer & more walkers.
Advanced is getting certain fish to chase other fish & handling collisions (fish eat each other, or turn into 3 fish, etc)