Sentence:  Through 1911 and 1912 , as the Cubist facet-plane 's tendency to adhere to the <WSD>literal</WSD> surface became harder and harder to deny , the task of keeping the surface at arm's length fell all the more to eye-undeceiving contrivances . 
Meaning of the word marked with <WSD> tags:  being or reflecting the essential or genuine character of something