However, tessellations can be very complex. Any figure can be used, not just geometric shapes. Unfortunately, the number system that we used to name our previous examples would not apply to these tessellations. The naming system is used when the tessellation is made of regular polygons, but not for other shapes. For example, if a tessellation has a 10-sided star, there would be no way to determine if the 10 in the name represented a star or a decagon.