To Spiral or Not to Spiral
It's not a spiral -- really! The concentric circles just make you think that. Try moving your mouse around one of the circles to prove it. Hopefully you won't feel too dizzy!
Perhaps the rest of these other optical illusions won't fool you so easily!
Scintillating Grid
How may black dots do you see in the intersections of the grid above? Who would have thought such a simple task would be so tricky!
Heads Up
Can you tell who's head belongs on which body in this confusing optical illusion?
Polka Dots in Motion
The dots won't stop moving!
Ebbinghaus Illusion
Which orange circle is bigger? If you said neither.. you'd be right! These 2 orange circles are the exact same size.
Hallway Rings
You might not believe it, but this two pictures of the same hallway taken at different angles. This probably took a lot of work to pull off, but the effect is amazing!
Merman
Is this a drawing of a man, or mermaid, or what?
Blivet
This optical illusion could drive you crazy! Three circular prongs become two rectangular prongs. That's impossible!
A Tweeting Caterpillar
Cute caterpillar... or is it?
Focus on the Dot
Got your eyes on the center dot? Now, move your head forwards and backwards!
Salvador Dali
Take a moment to absorb all the hidden details in this Salvador Dali painting!
Soccer Players
At first glance this looks like 2 soccer players battling it out for possession of the ball -- but what's really going on here?
Which Animal Do You See?
If you see 2 animals, which one did you notice first -- the duck or the rabbit? How long did it take you to spot the other one?
Bezold Effect
This optical illusion is named after a German meterology professor. He found out that colors look different depending on which color surrounds them. So here, the red surrounded by white looks lighter. The black-bordered red appears much darker.
Cafe Wall
The horizontal lines look bent -- but they're actually parallel. The illusion lies in the grey border surrounding each tile.