Titre : Geometry behind Art: Tessellations, Reversibilities and Decompositions of Polyhedra Exposant : Yin Akiyama R√©sum√© : Many recent results on polygons and polyhedra with beautiful applications for paintings will be presented. The lecture consists mainly of the following three topics: (1) You can be an artist like Escher. (2) Dudeney’s Haberdasher’s Puzzle and its variations. (3) Find atoms for polyhedra. Many artworks will also be exhibited.