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"Affordance refers to the potentialities and constraints of different modes – what it is possible to express and represent or communicate easily with the resources of a mode, and what is less straightforward or even impossible – and this is subject to constant social work. From this perspective, the term ‘affordance’ is not a matter of perception, but rather refers to the materially, culturally, socially and historically developed ways in which meaning is made with particular semiotic resources.The affordance of a mode is shaped by its materiality, by what it has been repeatedly used to mean and do (its ‘provenance’), and by the social norms and conventions that inform its use in context – and this may shift, as well as through timescales and spatial trajectories." https://multimodalityglossary.wordpress.com/affordance/