Polygraph makes it possible to transform any letter into another when you walk around it.
This system is composed of two elements, a wooden structure, and square modules
of varnished paperboards, each painted with a black line, curve or angle. Each letter is
made up of six parts. The various modules on offer (square, full, curved, etc) make it possible
to obtain many different letters. The four sides of the structure
permit to show four different
letters or signs, that the passers-by can read only when they are in the right direction.
