Short idea (136): The eyes and ears are extra-sensitive parts of the skin and sights and sounds can be thought of as feelings received through touch. At the same time, the less specialized areas of the skin can be thought of as relatively insensitive eyes and ears that receive sights and sounds through touch. — If this isn't true, it is a useful mental exercise in introspection.

Psychological Exercise 5: Ways of looking at eyes, ears, and skin

Picture the eyes and ears as extra-sensitive parts of the skin and sights and sounds as feelings received through touch. At the same time, picture the less specialized areas of the skin as relatively insensitive eyes and ears that receive sights and sounds through touch.