. . . "Such a sign 3000 can be displayed many other places, such as inside a building, on a floor, wall, or ceiling, in a corridor, underwater, submerged in a liquid other than water, or in many other environments. [0262] Referring to FIG. 32, a sign 3200 can consist of a backlit display portion 3202 and a configuration 3204, such as of letters, numbers" .