Perhaps the composition and layout of surfaces constitutes what they afford. (Gibson, 1979, p. 127).If see-ability were an affordance, then maybe it could be an affordance that is constituted by the composition and layout of surfaces.
If ability-to-be-an-occluder were an affordance, then maybe it could be an affordance that is constituted by the composition and layout of surfaces.
I don't know that these are the kinds of affordances that EPists have envisioned. Maybe not. But, they look to be exceptional cases. The point of the exploding boxes cases is to get a clear simple case to use as a beach head, then press on from there. I don't think one necessarily has to eliminate all cases of the composition and layout of surfaces constituting affordances in order to challenge the significance of the view.
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