Here's a little more context about the author's motivation: https://mathstodon.xyz/@csk/116162797629337132

> In my online undergraduate P5.js course, students are about to begin the module on motion and physics, including a bit of physics simulation using Matter.js.

When did things get specialized this much?

Oh cool, a product of Waterloo's Craig Kaplan, most famous for his work on the discovery of the einstein monotile