I went to the streets of Mexico D.F. to make a knowledge exchange: I asked people to teach me some Mexican words used to name a group or type of people. I gave them a fragment of a book on Mexican society that they could cut themselves, preferably in the form of a geometric figure, as a transaction of theoretical knowledge for popular knowledge.
Some authors, such as Zygmunt Bauman, see in geometry the archetype of the modern mind. It is possible to find a relation between common ways of cataloguing groups of people and the early-modern forms of organizing the social space, since society is still being understood from scheme-based hierarchies.