Also on the topic of artistic notions with regard to urbanism was Louis Sullivan's "The Tall Office Building Artistically Considered" of 1896. In this essay, Sullivan penned his famous alliterative adage "form ever follows function"; a phrase that was to be later adopted as a central tenet of Modern architectural theory. While later architects adopted the abbreviated phrase "form follows function" as a polemic in service of functionalist doctrine, Sullivan wrote of function with regard to biological functions of the natural order. Another influential planning theorist of this time was Ebenezer Howard, who founded the garden city movement. This movement aimed to form communities with architecture in the Arts and Crafts style at Letchworth and Welwyn Garden City and popularised the style as domestic architecture.