The authors claim that the use of the relative pronoun that clearly marks the relative clause as being presupposed because “ballet that told no story “ is s paraphrase of “abstract or pilotless ballet” Had the obituary writer use which instead of that , they argue, he would not have treated the information as given but would have been refreshing the reader’s memory. Which is explanation as pre-established. Invoking the notion of “mental paths,” the authors propose that that is “smooth and easy “while which is” slower and a little rougher.” Finally , they claim that the relative clause is more tightly fastened to the head noun with that than with which , something Olofsson (1981) had also argued in the discussion of the example “She was a girl . . . with eyes that fleshed at the guests.” Olofsson had suggested that changing that to which in this sentence would force a looser connection between the head noun and relative clause.