The centerfold or centrefold of a magazine is the inner pages of the middle sheet, usually containing a portrait, such as a pin-up or a nude. The term can also refer to the model featured in the portrait. In saddle-stitched magazines (as opposed to those that are perfect-bound), the centerfold does not have any blank space cutting through the image. Though the term has become linked in the public consciousness with erotic material or models, many other magazines such as Life, Time and National Geographic have published fold-out spreads on other subjects.