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I was expecting to see something completely unsolvable on a trackpad.

This looks pretty sweet, I wonder how the shape matching works.

Wow, that's the exact opposite of what I ran into:

It's a good idea, just needs to be a little more on the lenient side for those of us who aren't artistically inclined.

Edit: Hmm if you go faster it has a fuzziness to it:

That's thanks to mrdoob's Harmony, specifically the Ribbon brush (http://mrdoob.com/projects/harmony/)

I got the circle and after 8 tries on a trackpad I was unable to get it

Yeah, I'm planning to have a switch to revert to default letter-based CAPTCHA for cases like this. thx.