Look
closely at tile A and B. They seem to be different
shades of gray. They are actually the same shade.
Don't believe it? Scroll down to be convinced.
Scroll down...
Scroll down...
Scroll down...
Here, we've added a rectangle, and you'll see both tiles are the
same shade of grey. You can do it yourself by opening
up the image in Paint or another image editor and
put the 2 tiles side by side.
