What is the most underrated word in web design? | Smashing Magazine - Filemaker UI tip | Web Design Ideas | Scoop.it
An “affordance” is a perceived signal or clue that an object may be used to perform a particular action. A chair sits at around knee height and appears to provide support. It affords sitting. A toothbrush has a handle a little longer than the human palm. It affords gripping.

Via Didier Daglinckx