Untitled (Air Bed II) , by rachel whiteread , 1992 , sculpture , Conceptual Art, Post-Minimalism style , Furniture, Beige
A mattress that is sitting on a wooden floor.
A square piece of cardboard is sitting on a wooden floor.  The cardboard is beige and has ridges and bumps on it.  There is a white wall behind the wooden floor and the cardboard.