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4:23pm on Wednesday, 8th October, 2008:

Persistence of Vision


What does this say?

Hmm, how about this?

Put them together and:

That's only a simple experiment, but it seems to suggest you can use persistence of vision as a CAPTCHA.

Not if you get epilepsy, obviously...

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Copyright © 2008 Richard Bartle (richard@mud.co.uk).