In his books The Silent Language (1959) and The Hidden Dimension (1966), the American anthropologist Edward T. Hall has provided an excellent survey of human evolutionary history and an introduction to human senses, their features and importance.1 Sensory development is closely tied to evolutionary history and can be simply classified into the “distance” senses: seeing, hearing and smelling, and the “close” senses: feeling and tasting, which are related to the skin and muscles and thus the ability to feel cold, heat and pain as well as texture and shape. In contact between people, the senses come into play at highly disparate distances. Sight is the most highly developed of our senses. First we register another human being as a dim shape in the distance. Depending on the background and light, we can identify people as human rather than animals or bushes at a distance of 300 to 500 meters (330 to 550 yards). Only when the distance has been reduced to about 100 meters (110 yards) can we see movement and body language in broad outline. Gender and age can be identified as the pedestrian approaches, and we usually recognize the person at somewhere between 50 and 70 meters (55 and 75 yards). Hair color and characteristic body language can also be read from this distance