It is able to mold itself to the shape of any object that puts pressure on it and, yet, when the object is removed, it will slowly return to it's original shape.
The picture that comes to mind is the hand above the memory foam mattress that still has the hand print showing on it.Memory foam is an open celled foam, which means that air is free to move from one cell to another, so when pressure is applied, the affected cells collapse and you feel sort of like you're floating down into the material.

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