It works better with a larger image, but I couldn’t find one.
Not watery, but everything does constantly look like it is moving slightly upward for a couple minutes, due to looking at notes moving downward for so long.
I clicked on the first one, and I have to admit, it was the second-trippiest optical illusion I’ve ever seen (it only affected a couple object in my vision for some reason. Trippier was the part when I was looking at it and it seemed to stop!)
The first-trippiest? Lilac Chaser.
Thanks for this.
I like these. They seem to be moving, but they aren’t.
Hmm, migraine sufferer taking an anti-epileptic which causes myoclonic twitch… dare I click the link? ponders for a brief moment Yes, I dare click the link. 
Whoa!!!
I read about these and played with writing a VB program that does this! I can’t remember what it’s called, but the effect is named after its discoverer I think. Supposedly if you have an on-off cycle divided into 6 parts, with a different shade of lightness for each part, you can get red by flashing gray-white-white-black-black-black, green from white-gray-white-black-black-black, and blue from white-white-gray-black-black-black. Seems to have to do with the response times of retinal cone cells to rapidly changing light levels. To me the “blue” was the strongest whereas the “red” seemed more of an orangish-amber hue.
I’ve come across the planetarium page before. It’s a great way to waste an hour or so.