A playscape is either a piece of land modified for children's play (a natural playscape), a particular structure on a playground, or a nontraditional type of play environment. Landscape architects and designers are increasingly using the term to express areas of cities that encourage interaction and enjoyment for all ages. The term was probably first used in the mid-twentieth century, possibly first attributable to the National Institute for Architectural Education in 1957, and associated in the 1960s with the New York-based Playground Corporation of America. It is mentioned by Joe Frost in his 1992 book, Play and Playscapes, referring to attempts to replace or add on to the rubberised surface, metal and plastic of traditional playgrounds.