The institutional structure of society supplies the typology for our actions. Only very, very rarely are we in a position to think up new types to pattern ourselves after. Mostly we have a maximum choice between type A and type B, both types predefined for us a priori. Thus we might decide to be an artist rather than a businessman. But in either case we shall come up against quite precise predefinitions of the things we must now do. And neither way of life will have been invented by ourselves.