What is the meaning of the furniture term Cheesebox Seat?

The term cheesebox seat refers to a type of seat or chair that has a box-shaped cushion or upholstery. It is called a cheesebox seat because the shape of the cushion is similar to that of a cheesebox. The term is often used in reference to antique or vintage furniture styles. American chair seat, usually rush, and round or bell shaped. With thin rim of wood bent around the edge.