Mary Roach's book "Gulp: Adventures on the Alimentary Canal" explores the fascinating functions of the human digestive system and the sensory experiences associated with it. One notable point she makes is that humans are primarily designed for sight rather than smell, highlighting how our brains can process visual information significantly faster than olfactory signals.

This observation emphasizes the importance of vision in how we perceive and interact with the world. While our sense of smell plays a valuable role, the speed and efficiency of our visual processing are critical for our survival and understanding of our environment.