The Stockholm-born artist Oscar Reutersvärd (1915–2002), "the father of the impossible figure", pioneered the art of impossible objects. These are objects such as what was later renamed the Penrose triangle, which appear solid on the page, but cannot be built. This triangle, first created in 1934, was honored in 1982 on a Swedish stamp. His work inspired the much more famous artist of the impossible, M. C. Escher. Whereas Escher builds inhabited worlds around impossible objects, Reutersvärd's designs generally consist of pure geometric forms. Reutersvärd produced more than 2500 figures all in Japanese (parallel) perspective. There have been numerous books published on his works in Swedish, English Polish, and Russian.
