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Affordances, like signs, are relational: flexible, open, and contextualised, within a system of differences in a user community (or several user communities). They are, potentially, opportunities for perceptive-action / for developing capabilities, at an individual and/or group level.

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Affordances are neither 'in' the user, nor are they 'in' the environment.  They are, rather, the product of the interaction between the user and the environment, which tends to change both the user and the social ecology. Each person's affordances 'work' for them and their context. They may or may not work for anyone else.