Triangle is a shape used in art too. We find it for example in a lot of artistic works of modern artists such as Vasilij Kandiskij and Auguste Herbin.
In this triangle drawn by M.C. Escher you can see half lizard, half bat and half fish.
Make six copies of this triangle. In each one color the half figure with different colors, keeping the same colors for every copies.
Cut the triangles and enjoy yourself to join it, to create some geometric shape.
Compare the works done with your school mate and take part on debate.