Experiment 1                               Experiment 2           

In Experiment 1, both of the dots on the left appeare to move to the single dot on the right, because this is the only logical place the brain can invent for them to go. In Experiment 2 however the bottom dot appeares to hide behind the patch on the right. the brain, through evolution, recognizes that objects in the real world do not spontaneously disappear and reappear. The closest real world situation where this occurs is when a walking person (or animal) passes behind an object such as a tree and the tree momentarily occludes (or hides) that person. Thus, these experiments are proving that the brain is trying to offer a rational explanation for the disappearing triangle and the dot. The brain interprets their disappearance as the closest opaque object simply covering it.