Basic to Giacometti's vision is the phenomenon of distance, in actual space and in the psychology of seeing...The celebrated wedge-shaped heads of his brother, Diego, with their uncanny likeness, are demonstrations of Giacometti's notion that where the gazes of the right eye and the left eye intersect, the width of objects diminishes toward zero and a head consists of a wafer of two profiles, a ketchup bottle of a vertical red line. Narrowing and elongation, accompanied by a strange fixity and transparency, occur, too in faces seen reflected in a bottle or a convex mirror. (H. Rosenberg, Art on the Edge: Creator and Situations, New York, 1975, pp. 121-122)