Which line is longer?



The black line in the back seems much
longer than the one in the front
because your brain assumes it is seeing
the effects of perspective. When the
background is removed, the lines are
seen to be equal!

Except when I scrolled down, all there was was:

_ _ _ _ _ _ _ _ _ _
_|_ _ _ _ | _ _ _ _

Another one

Are the horizontal lines parallel or do they bend?



By now, you realize that your eyes are fooling you.
The lines are perfectly horizontal...Grab a piece of paper
and line them up...Or better yet, put your head at the
side of the picture and view it across you monitor!