Nesi is reading biographies about Euclid, Descartes and Pythagoras. He is learning about different types of shapes, like circles, squares and pentagons. Nesi is also learning about how to build structures. He is finding out how to build something small, like a box, or very big, like a pyramid! His next book will be about how to use a map and navigate. Can you guess what Nesi is reading?