A really neat way for kids to experience prime and composite numbers

Yesterday I saw an incredible program shared on twitter:

I thought it would be really fun for kids to watch this program play out and describe what they saw, so I shared it with my own kids. Here’s what my 7th grader thought:

Here’s what my 9th grader thought:

I really love this program and especially love how kids can use it to experience some simple ideas in number theory.