The fold is the whole model. A closed-cell pad is defined by its accordion geometry, and faking that with a normal map on a flat slab fails from the first oblique angle — the panels need real thickness and real edges, because the shadow between them is what identifies the object. Modelled with the fold geometry intact so it can be posed flat, stacked, or leaned against something, and so the panel edges catch light individually. The foam surface carries the compressed, slightly glazed sheen closed-cell foam develops where it has been slept on, with scuffing at the panel corners where it drags. A small, cheap prop with a payoff out of proportion to its size: one of these unrolled on a floor establishes that somebody stayed the night, which is a whole scene's worth of implication from a nine-dollar asset.