Can you tell us what vertical line is longer? Post your answer in our comments.
I bet you get this one wrong!
Do you think the red lines are wavy? Well they arn't.
Do you think this is a Young Couple or a Skull?
Do you think this is a Young Woman or an Old Lady?
KST saw a hump. How about you?
Is this a huge bird or some guy out fishing?
Don't believe it? Try opening up the image in Paint or another image editor and put the 2 tiles side by side.
Girl Illusion - Do You Have a Dirty Mind?
If you move away from the center you can see the circle start to move.