Shapes that Tessel AteTessel is a childrens educational book (ages 2 to 12) that illustrates a fun way of introducing the names of different geometrical shapes and looking at the mathematical concept of tesselation using geometrical shapes to fill a specified region completely, without leaving gaps (for example, a square or a hexagon can be tiled without leaving any gaps, whereas a circle or a pentagon could not). Using characters like Tessel, mathematical concepts can be