Yep... the horizontal lines ARE parallel!

This may look like a spiral,
but they are individual circles.

Those columns look funny, eh?

Stare at the flag for 15 seconds. 
Afterwards, look quickly at the 
white area of the screen. The 
afterimage will be a ghostly 
red, white and blue flag!

Good luck following these directions!

See the other face?
Clue... look at the image upside down.

The window of opportunity... impossible!

Fixate upon the black spot in between the uniform cyan and yellow areas for about 30 seconds. Then scroll down and shift your gaze to the black spot in the 2nd image. The image appears uniform after this adaptation.  

It may look like two different shades of green, but the color is actually identical in this illustration.

The curvy looking red lines ARE straight!

Who is upside down?  :)

The star is not closer to the top of the
triangle than the bottom-it only looks it.

The inner circle is NOT egg-shaped!

Can you see the two hidden faces?

The letters are all upright. It's the black
and red overlap outlines that make them
appear tilted. Only try this when sober.

Is this a straight-edged square?  Yep!

See how when you move your eyes around this graphic
the circle in the middle starts to float right off the page.

How many legs do you see?

Can you see the Indian chief AND the Eskimo?

Can you see both the face and the word 'liar' in this picture?

Can you see both the young woman and the old lady?

Yes... those lines are parallel.

Look closely... can you see the face?
(hint: step back from your monitor)

Which line is the longest?  They're the same!

Are those monsters equal size? ...yes!

Close your right eye, and look at the number 1. 
Slowly move your eye from number to number,
and suddenly the yellow dot will disappear.

Close your right eye and look at the center of the circle on your right.  After 20 seconds, while keeping your right  eye closed, look at the center of the circle on your left and notice how the gray is gone.

Do you see both the face and the sax player?

Find the black spot...  yeah right?!?

The impossible triangle!

Warped Squares - there are no
curved lines in the figure above

There are no gray spots at
the corners of the squares