I like this, but I think there needs to be some additional security placed on it. It's pretty easy to make a computer tell you when an image is a perfectly str

I like this, but I think there needs to be some additional security placed on it. It's pretty easy to make a computer tell you when an image is a perfectly straight advertisement and when it's a jumbled mess (or at least with enough accuracy to beat this captcha pretty frequently). You have to make the final image still only human readable. One way I can think of is to have the slider "twist" two images into each other, and there are two spots on the slider which reveal a clean image (one spot for each image). Text above the field says something like "Slide until you see the __________ image" and that way there would be additional human verification. Just thinking out loud.