These can contain springs, memory foam, or a mix of the two. A foam-on-the-floor sleeper like the Teddy sofa has a comparatively thicker mattress, around seven to eight inches, because the panels ...

Say you want to move a two-dimensional shape — your sofa (disregarding its height ... Perhaps even more intriguing, Gerver’s sofa, unlike more familiar shapes, is defined in such a way that its area ...