Architecture, without a doubt, is one of the most beautiful forms of knowledge, a singular construction of sight and thought from our own subjectivity: beyond reason and its limitations, beyond emotion and its predicaments. A difficult equidistance. How to learn this imprudent tightrope-walking profession? For Le Corbusier it was about transcending the reasonable: ‘to think with reason paralyses the world’, he said to us. The present collection of writings organises, not thoroughly, four centres of artificial gravity –continents, manufactures, systems and transitions– a happy and accumulative choreography whose value has to be sought not so much in each of the texts separately, as in the resonances and tensions that appear and hide between them: learning and its chore[oh]graphies.