Cool idea, but it seems to change just after I blink, so it is very easy to spot the changes. I guess my system has too much delay in capturing the images.

And if I keep my eyes closed longer, it seems to run through lots of different changes, and then do another change as soon as I open them. You can test this by only closing one eye - it seems to think you're blinking really rapidly.

I don't know exactly how it works, but it seems to act something like: "for each frame of video, if we can see an eye that is closed, change something on the page". I think it should change to "if we can see an eye that is closed and there wasn't a closed eye in the previous frame".