Abstract
A trick art drawing system based on a torus type impossible figure generating algorithm is
constructed. Proposed algorithm is based on the shapes and positions of corners of torus figures.
Proposed system is able to generate an arbitrary n-bar torus type possible or impossible figure by
interactive mouse-cricking operation on a figure generated only from initial n+1 inputs. It is possible to
draw a trick art by painting each face of obtained figure. The proposed system aims a basic tool for
experiments on visual psychology and an education support tool for discrete mathematics classes.
