Sentence:  Some time in 1912 , Picasso cut out and folded a piece of paper in the <WSD>shape</WSD> of a guitar ; to this he glued and fitted other pieces of paper and four taut strings , thus creating a sequence of flat surfaces in real and sculptural space to which there clung only the vestige of a picture plane . 
Meaning of the word marked with <WSD> tags:  any spatial attributes (especially as defined by outline)