In this activity (on pages 41-47 of PDF), learners explore tesselating geometric patterns (repeated shapes, similar to the art of M.C. Escher). They play with existing shapes, either with laminated cut-out pieces of paper or wooden blocks. They also can make their own tesselations: the lesson plan describes how to take a basic tesselating shape like a triangle or a square and modify it to make a more complicated tesselation. Learners can make simple translation tesselations as well as more complex rotation tesselations.