History of stamps
Souvenir sheets (miniature sheet)
Stamps should be distinguished from cinderellas, stamp-like labels that resemble, but are not, postage stamps. Cinderellas might be commemorative labels, such as those issued to support the Transmissippi Exposition in Buffalo, New York (USA) in 1901 (one of these has now been converted into an actual postage stamp), or may be postage stamps for imaginary countries or micronations. Designs for surrealist postage stamps appeared in the 1976 World Surrealist Exhibition catalogue, and Clifford Harper has even designed "anarchist postage stamps".