Is it really yellow?

The brain is pretty easy to fool. It's designed to interpret what we see, hear, and sense in other ways. By "interpret" we mean that it takes the data from the various input points and converts them into things that we can consciously comprehend. Take the image above, for example. It's yellow, right? Well, not exactly, as the video below by VSauce explains.

They go into other illusions and concepts as well which are equally interesting, but the explanation about real yellow versus the yellow we perceive on the screen is the real kicker. Enjoy!