ANDRÉE PUTMAN Decorator-BECAUSE in a six year career she has established herself as the most exciting interior designer on either side of the Atlantic, recreating lost masterpieces of modernity from Mallet Stevens chairs to Eileen Gray rugs, and transforming Morgans into the handsomest hotel in New York. BECAUSE she has turned plainness into ravishing style using spare forms, a black and white palette, and an understated mix of classical and modern to smooth the rough edges of high tech. BECAUSE in her hands checkerboards are no longer square.