Popular at the turn of the 20th century, Functionalism is a philosophy of architectural design holding that form should be adapted to use, material and structure. From the Functionalist point of view, good, timeless design refrained from anything impractical or purely decorative, thus rejecting any forms that were ornate or historicizing. Its proponents believed design should not be guided by visual preferences, as these were always subject to fashion and the spirit of the times. The value of good design was not measured by an item's visual appeal, but by its utility value, durability, low production costs, suitable materials, and sound ergonomics. In 1890, American architect Louis Henry Sullivan coined the movement's guiding principle – "form follows function" – which has been quoted ever since (see Bauhaus style, Modernism, New Building and reformed housing). To this day, Functionalism is slammed by its opponents as being cold and unfeeling.