"Affordances are not a distinct aspect of a single artifact, but rather are experienced as nested layers" #readingToday  

We argue that affordances are not a distinct aspect of a single artifact, but rather are experienced as nested layers at different levels of scale. Likewise, affordances are not experienced in isolation but as part of a complex ecology of alternatives. Finally we found that vernacular affordances are often invoked strategically as either "choices" or "constraints"—an opposition that maps onto different ways of accounting for material structure.