Hands are a crucial part of the way we interact with the world. Hands feel things, and hands manipulate things. Almost every object in the world offers some kind of feedback, they respond in the hand as they are used. There is a reason fingertips have some of the densest areas of nerve endings in the body. This is how we experience the world close up. This is how tools talk to us. The sense of touch is essential to everything humans have interacted with for millions of years.