Start by giving your students this challenge. After that, students will learn what tessellations are. Show your students a couple tessellations in nature and human-made objects, then ask your students to think of others. There are tessellations in honeycombs, tile floors, blankets, and toilet paper. Also, show your students that tessellations can be found in art, including ancient Greek mosaics, and in some of the works of MC Escher. Show your students examples of tessellations involving one prototile, as well as examples involving multiple prototiles.
TODO: When should tessellations be introduced? The proof in this topic depends on the student knowing what tessellations are.