Frank Lloyd Wright is recognized as one of the greatest architects of all time. From his early career at the firm of Adler and Sullivan to his final designs, Wright produced a wide range of work numbering nearly 1,000 structures, of which approximately 400 were built. His innovative designs include the Prairie House and the Usonian House. The young architect's first work was nominally a Silsbee commission: the Hillside Home School built for his aunts in 1888 near Spring Green, Wisconsin. While construction of the Hillside Home School was underway, Wright went to work for the Chicago firm of Dankmar Adler and Louis Sullivan, working as a draftsman for the Auditorium Building, which, at the time of completion in 1890, was the largest building great of Chicago. He remained with that firm until 1893, during which time he absorbed Sullivan's influence and designed several homes, including one for himself in Oak Park, Illinois, which was built with Sullivan's financial assistance. "Moonlighting" on his own commissions led to a break with Sullivan. in 1893 and Wright opened a separate studio. His early commissions primarily involved the design of private homes in Chicago's wealthier suburbs and include the 1893-94 W. H. Winslow house in River Forest, Illinois, considered by Wright to be his "first." Unfortunately, many of the buildings he designed at the turn of the century have not survived. (FranklloydWright.org) During the turn of the century, Wright's distinctively personal style was evolving, and his work in these years prefigured his so-called "prairie style," prairie houses featuring low, horizontal lines that were intended to blend with the flat landscape that surrounds them. Typically, these structures were built around a central fireplace, consisted of large open spaces rather than strictly defined rooms, and deliberately blurred the distinction between interior space and the surrounding terrain. Wright hailed "the new reality that is space rather than matter" and, regarding architectural interiors, stated that "the reality of a building is not the container but the space within it." The W. W. Willits house, built in Highland Park, Illinois in 1902, was the first house to embody all the elements of the prairie style. His masterpiece of the prairie style is the Robie House, built in Chicago in 1909. Wright aspired not simply to design a house, but to create a complete environment, and he often dictated the details of the interior. He designed stained glass windows, fabrics, furniture, rugs and home accessories.