Heinz Mack, next to Oto Piene and Günther Uecker one of the most important ZERO protagonists, describes the inspirational moment for his ever new impressive light reliefs that are characterized by reduced aesthetics as follows: "An unexpected opportunity to visualize aesthetic motion coincidentally occurred when I stepped onto a thin metal foil lying on a sisal carpet. When I picked up the foil the light was vibrating. Since the carpet was factory-made, the impression remained mechanic and decorative; the motion of the reflected light was entirely dull and unimportant. My metal reliefs, I prefer calling them light reliefs, formed by just the pressure from my fingers, need light instead of colors to come alive. Owed to the mirror-like polish a slight relief is enough to shake the the light's calmness and to make it vibrate. The potential beauty of these structures makes for a pure expression of the beauty of light." (Quote after: Dieter Daniels and Barbara John, Collection Cremer I, 1991, pp. 142-143). [JS]