Sentence:  Only when the collage had been exhaustively translated into oil , and transformed by this translation , did Cubism become an affair of positive color and flat , interlocking silhouettes whose legibility and placement created allusions to , if not the illusion of , unmistakable <WSD>three-dimensional</WSD> identities . 
Meaning of the word marked with <WSD> tags:  involving or relating to three dimensions or aspects; giving the illusion of depth