Opaque, translucent and transparent materials Light travels as waves. These are transverse waves , like ripples in water.

The first and most common type of shading used in U.S. design patents is opaque shading, which illustrates a non-transparent or non-translucent surface of an article of manufacture.

The glass frog's translucent stomach skin offers a window into its internal organs. New research finds this odd seeming trait may help the frogs evade predators.