“Gaver goes on to clarify his version of affordance by distinguishing between affordances themselves (i.e. the properties of things) and information about them (i.e. what we perceive). Gaver does this in order to show how we can be mistaken about affordances, claiming that if there is no information available for an affordance then it is hidden and that if information suggests a non-existent affordance, a false affordance exists.” (p52)
Gaver adds another perspective to affordance of false affordances. Without going to far down this argument what Gaver does provide here are clues to how the semiotics of visually communicating the affordance can be problematic.