Abstract: Electrochromic materials can be used in a multitude of fields to yield different effects. Importantly, a single chromatic variation may be used as communication means. Systems are described that use chromatic variations in culturally-meaningful ways.

Abstract: Game apparatus is provided with a transparent cylinder containing a dice support platform. The platform is movable by a manually operable lever to toss the dice. At the top of the cylinder there is removably mounted a slot-fed coin or chip container which is secured in a closed, locked condition by each of a multiple of key-operated locks. Removably fitted into the cylinder so as to be accessible to the players is a number of keys, two or so, for each of the key-operated locks, to be selectively tried by preliminary winners to determine the final winner, the one who opens the last of the key-operated locks.