“…Ultimately, "the affordances of the http://www.ecologyandsociety.org/vol20/iss1/art39/ environment are what it offers the animal, what it provides or furnishes for good or ill" (Gibson 1979:127), and they therefore guide action. Rather than involving higher-order cognitive processing, the perception of affordances is considered to occur simply through direct experience with an object in situ (Heft 2003(Heft , 2013. Affordances are analogous to Lewin's concept of valence (McArthur and Baron 1983), the 'pull' of a collection of psychological forces in the life space, expressed dimensionally as negative/unfavorable, i.e., movement away from the object, versus positive/favorable valence, i.e., movement toward the object , but Gibson's articulation more fully describes the nature of affordances, characterizing the worth of the object to the person in a contextually rich and action-centred way.…”