Are Squares A and B different shades of grey? Are you sure?

Drag the mask with the mouse (You may need to scroll down to see it) and align the holes over the image to see for yourself

If you still think it is a trick make two holes in a piece of paper and place it over your screen. Amazing !!!

There is a brown square in the middle of the top side and a yellow square in the middle of the facing side.
Are you sure?
Drag the mask with your mouse (you may need to scroll down to see it) and align the holes over the image to see for yourself
If you still think it is a trick make two holes in a piece of paper and put it over your screen. Amazing !!!