Whenever a cell is neighbored by a cell whose color is next in the cycle, it copies that neighbor's color-otherwise, it remains unchanged.
In cyclic cellular automata, an ordering of multiple colors is established. The Immigration Game and the Rainbow Game of Life can both be viewed and played here. Some investigations on the propagation of colors in the Rainbow Game of Life can be seen here.
The Rainbow Game of Life is notable for being somewhat analogous to genetic properties spreading through a population of creatures. Thus, a cell which is born from two black cells and one white cell will have a dark gray appearance. The Rainbow Game of Life is similar to the Immigration Game, only newborn cells instead are colored based on the average color values of their parent cells.
