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The blobs push the trail in front of them, like a body moving through water. A distance field tells every pixel how far the edge is, so the lines close to it slide away and the far ones stay.

I made this with Ollin, a creative coding framework for Swift and Metal. I wrote it for my sketches and use it every day. It is open source, in case anybody wants to play with it: ollin.art

Ollin projects lack hot reload — was there a reason to not include hot reload when loose sketches become projects?