How many legs does this elephant have?
These two parallel lines are in fact both straight!
When this image is flipped, it reveals a totally different picture.
Is this image really moving?
This square is actually perfectly drawn. It's the circles which make it look strange.
This shape would be impossible to build.
There are actually no black spots in this image...
Which can you see? Or can you see both an Eskimo and an Indian?
Looks like a normal triangle doesn't it? Well in fact, this would be impossible to construct.
Are these lines straight and parallel? Believe it or not, but the answer is yes!
Although it looks like both lines are of different lengths, they are in fact equal.
Can you see a young or old woman? Look closely, they're both there!
Squares A and B are actually the same shade.
How many 3D cubes can you see?
Believe it or not, there are only two colors used in this picture!