Global Positioning system (GPS), a map or a compass is not necessary to find the right way. Actually this demands a tremendous amount of computational power from today’s navigation computers. It can also be achieved by taking advantage of the laws of physical chemistry and practicing which is called “chemical computing”.The trick works thus a gel mixed with acid is applied at the exit of a labyrinth – i.e. the destination – filled with alkaline liquid. Within a short time, the acid spreads through the alkaline maze, although the majority of it remains together with the gel at the exit. When an alkaline solution mixed with dyes it adds to the other end of the maze, i.e. the entrance, it automatically seeks the way to the exit – the point with the highest acidity.
