Humans have learned to make paper from trees and books from paper. Books heighten our knowledge, that makes us understand that to make more books we need more trees. This ideal circle (in which man and nature grow together) is represented by Vesod with the symbolic images of the tree, the paper, the book and the seed. So to reach the Goal 4 of the project Towards 2030 (Quality education) we need to focus on the right of everyone to learn and on the education to sustainability.