Optical Illusion

Look at this picture.

There are 4 shades of blue.

Or are there?

Now.

Would you so kindly place your hand sideways (as if you were karate-chopping the screen) on a black line of your choice in the picture.

Bwaha!

It looks like the same shade of blue!!

Wowzers!

That is all. <3

xoxo

-Gabi