VARIABLE VISUAL EFFECTS

摘要

A structure, substrate or article has a surface formed with a series of profiled ridges (20), each ridge having a sloping side (21) and an opposite, inwardly-directed side (23) which is concave-curved in profile: the opposite sides of the ridges present differently coloured or patterned areas (D, L) so that different visual effects are seen by a viewer, depending from which direction (A or B) the surface is viewed.