Sentence:  At a casting workshop, an actor was performing a blank scene ... and he had not bothered to make any choices about why he was on stage, what his motivation was, what he was playing. He had decided who he was and where he was (on a <WSD>couch</WSD> with his girlfriend) but had not decided what he wanted. So the performance was flat and lifeless. 
Meaning of the word marked with <WSD> tags:  An item of furniture, often upholstered, for the comfortable seating of more than one person.