Full Idea
Propensities should not be regarded as inherent in an object, such as a die or a penny, but should be regarded as inherent in a situation (of which, of course, the object was part).
Gist of Idea
Propensities are part of a situation, not part of the objects
Source
Karl Popper (A World of Propensities [1993], p.14), quoted by George Molnar - Powers 6.2
Book Reference
Molnar,George: 'Powers: a study in metaphysics', ed/tr. Mumford,Stephen [OUP 2003], p.106
A Reaction
Molnar argues against this claim, and I agree with him. We can see why Popper might prefer this relational view, given that powers often only become apparent in unusual relational situations.