This is quite... Interesting...

[Kenners]

Being an eye doctor, stuff like this is always interesting to me. Stare exactly at the center for 30 seconds, then look at your hand.

http://www.neave.com/strobe/

Kenners

[Toad]

Being an eye doctor, stuff like this is always interesting to me. Stare exactly at the center for 30 seconds, then look at your hand.

http://www.neave.com/strobe/

Kenners

Here's another one:
http://www.doctorhugo.org/illusions/illusion4.html
My wife who is a lifelong migraine sufferer, got aura within a minute, followed by a huge migraine from this one.

I felt a fool for suggesting it. But the visual effect is very strong with this one.

[DonaemouS]

Being an eye doctor, stuff like this is always interesting to me. Stare exactly at the center for 30 seconds, then look at your hand.

AAAAAAAAAAAAAAAH

HELP ME!!!

[20FingerS]

Hahahaha, really nice way to get headache...
Funny stuff we do with our eyes (brain).

[Tuktuk]

Yes our brain is also not very objective in analysing things our eyes are delivering:

Field A has the same color as field B:



The lines are horizontal:

[GUMMY BEAR]

Wow! Thats weird. I used to have a book of those images where if you stare cross eyed at them for long enough they become 3D. pretty interesting.

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