I don't get it?!
I understand the top part of the pic, but what does putting your finger in-between the blocks do?What's not to get? Try answer the question at the top...
Its meant to make them look the same darkness
Its meant to make them look the same darkness
Odd, I don't get that at all??
It's an optical illusion. The middle part causes the brain to interpret the top panel as darker than the bottom one. When you put your finger across to block the middle part, the illusion fades and you can see that both panels are the same.