Juan Azpilicueta (Madrid, 1977) is an architect, designer and teaches art, maths and geometry. He has given courses in heuristics, applied creativity and work systems. He is passionate about music and art in all forms, and has an almost spiritual devotion to geometry. He also enjoys messing around on guitar and drums. He has published the books for children based on an ingenious page-folding system that makes reading and playing with them fascinating for different ages: Infinite Books. The Chicken or the Egg? and Infinite Books. The Solar System in Spanish and Catalan (Larousse Editorial, 2021).