2. Interface classification

2.1 Typology

A wide range of possibilities is available. Interface design is constantly evolving. We distinguish between :

• material interfaces (e.g. de facto interfaces, (§ 2.2 ), involving one or more proprioceptive stimuli;

• immaterial interfaces, such as timers, which, depending on the hold time or repetition of an action, activate different functions on the same interface. Memory is called upon.