Pharaoh cuttlefish they can show a mottled white and brown color, with a center circle of brown. The mechanism for color is the same in the Pharaoh cuttlefish as it is in other cuttlefish. This colour-changing function is produced by groups of red, yellow, brown, and black pigmented chromatophores above a layer of reflective blue and green tinted iridophores and leucophores, with up to 200 of these specialized pigment cells per square millimeter. These sacs of color are controlled by rings of muscle around the sac. The cuttlefish expands and contracts these muscle rings in order to show different colors. It is
Canadian Olympic stamps Olympics. Rolf Harder, the designer of the Innsbruck Winter Games stamp, studied both Fine Arts and Graphic Arts at the Academy in Hamburg, and worked professionally in that city before coming to Canada in 1955. He has created a graphic design using the official Innsbruck Olympic Symbol combined with a stylized snow crystal. The blue-grey background represents a cold winter sky and serves to dramatize the five bright colours of the Olympic rings. The stamp for the 1980 Winter Olympic Games at Lake Placid, N. Y., was designed by Clermont Malenfant of Design G, Montreal. Using an action shot of