At the height of his Art Nouveau production, architect Victor Horta worked in Belgium, mainly for wealthy urban clients of progressive taste who allowed him to practice a unique artistic and luxurious Art Nouveau. His townhouses, which have come to define the appearance of the luxurious Art Nouveau style in Belgium, were integrated environments, where the artist took the dual role of the architect and designer. Horta revolutionized the very essence of buildings by using open floor plans and by the use of ironwork in an innovative way. The interiors were characterized by a delicacy and curving "femininity," yet alloyed by modernity in the choice of materials and their interpretation as abstract plant forms. The iron columns sprout slender iron strips to support the floor above. No attempt was made to conceal the constructional elements, but they were rather emphasized.