Praxis is the sans serif counterpart to Demos, and like Demos it was designed for the Hell company. Indeed, the same research that went into Demos also laid the foundations for Praxis. In the much-used sans serifs of the sixties and seventies, Helvetica (1957) and Univers (1957), there is a vast difference between the extreme weights, i.e. light and extra bold (or ‘black’), and there is considerable difference between the intermediate weights too. Because in practice the extreme weights are seldom used, in the case of Praxis I decided to leave them out and keep the other weights close together. The same approach was used for Vesta (2001).