Sentence:  Everywhere else his ideas lay or hung in visible form : his models , <WSD>drawings</WSD> , ten foot canvases in monochromes 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:  a representation of forms or objects on a surface by means of lines