What you see may be very much related to what you’ve just felt. Even though we were taught at school that each sense is processed in another area of the brain it seems that this theory may be wrong and that there is a lot more to understand about the way human brain works.

As an example, a light ripple of pins moving up the fingertip tricked the subjects of a study into perceiving some lines moving on a screen as moving down, and the other way around. So, there is something going on.

In order to take the theory even further, a trick of perception named aftereffect was used by scientists, a phenomenon that occurs for example when watching a waterfall. Staring at it for some time will eventually make one perceive the stationary rocks as moving up. This happens because the neurons which are in charge of the “down” get tired while the “up” ones are still fresh and create this impression.