Perceiving Potentiality: A Metaphysics for Affordances by Barbara Vetter https://philarchive.org/rec/VETPPA https://www.human-abilities.de/publications/vetter2020perceivingpotentiality/index.html Vetter introduces a very useful concept for seeing ability of stuff, partner or joint potentiality. What can two things do together that neither can do alone? A key has the potentiality to open locks of a certain shape. A compatible lock has the corresponding potentiality to be opened by such keys.