Sentence:  Everywhere else his ideas lay or hung in visible form : his models , drawings , ten foot canvases in <WSD>monochromes</WSD> from his painting days , and underfoot a windfall of broken-backed books that looked as though their insides had been ransacked by a maniac . 
Meaning of the word marked with <WSD> tags:  painting done in a range of tones of a single color