A Lil' Libros Bilingual Book of Shapes Explore the city of Tenochtitlan along side Cuauhtémoc, the last Aztec emperor―where you’ll come across the circulo (circle) in the Aztec calendar, the triángulo (triangle) in the pyramid, the heart in the shield of an Aztec princess, and more! This book introduces your little one to shapes and their first English and Spanish words. Unable to find bilingual first concept books she could enjoy reading to her baby, Patty Rodriguez came up with the idea behind Lil' Libros.