“Our perception does not identify the outside world as it really is, but the way that we are allowed to recognize it, as a consequence of transformations performed by our senses. We experience electromagnetic waves, not as waves, but as images and colors. We experience vibrating objects, not as vibrations, but as sounds. We experience chemical compounds dissolved in air or water, not as chemicals, but as specific smells and tastes. Colors, sounds, smells and tastes are products of our minds, built from sensory experiences. They do not exist, as such, outside our brain. Actually, the universe is colorless, odorless, insipid and silent.”

– Dr. Jorge Martins de Oliveira