Look at the images we show you below. In this case you should look at the different colors that make it up.
How many different colors are in this image?
Two of the pictures that make up the image are the same. Which?
In the first image there are only two colors, red and green. When combined it seems that we have two shades of red but it is only an illusion. In the second case, boxes 3 and 4 are exactly the same, although it gives the impression that one is darker than the other again our brain deceives us.