[sross]

insanely interesting, will wait until some others comment on real world use

*update: ok I've installed on one of my boards getting a ton of spam lately. I have disabled human verification and am now only using this motion captcha. Was very easy to install and two tests worked great. Hopeful this will put a stop to robots unless they can work out a way to hijack the underlying script and bypass it (not sure how likely that is). I'll monitor my board for a couple days and report back.

update2* So far so good. Running on 2 different boards now, 5 new registrations without issue and no spam. Only thing I changed was the phrase "Draw Image" to be more detailed for less computer oriented users:

Please trace the image to the right with your mouse (*tip: take it slow, left click at the starting point and continue to hold your mouse button down while tracing the line)

update3* 12 registrations, no issues and no spam. I would have definitely had a couple spam posts by now. So far this is proving better than recaptcha.