This is a good collection of illusions, some of which I haven't seen before. I'm not so sure why they had to include a stupidtramp sound track though.
Here's another collection with some overlap and a techno soundtrack:
I can see the duality in all of them except one. The first video, third illusion. It looks to me like an encampment of people around a domed hut. I can't see anything else there. There seems to be a closed fist perhaps, in the cloud on the right hand side, but apart from that I'm at a loss.
Can anyone help?
Nothing like making your mind bend. Whew! It's hard to see what we don't see. Great videos.
Simarillion, try turning your head counter-clockwise ;)
or just write this sentence backward:
e c a f a s i t i
also, the "left brain right brain" comment for the stroop task is hilarious.