Can you tell us what vertical line is longer? Post your answer in our comments.
Another geometry optical illusion. This is an impossible triangle - Part 2.
This is a cool picture done by a good artist.
KST thinks this is a spiral. Do you agree?
Here is a mind trick. Count the legs on the elephant.
Is this a perfect square or not. We think it is.
KST can only see about 14 cubes.
Don't believe it? Try opening up the image in Paint or another image editor and put the 2 tiles side by side.