“I know about Occam’s razor,” Vivien said. “It’s not a principle so much as a heuristic, to avoid stacking a problem with unnecessary complications. Except that sometimes a complex problem can only be solved with a complex answer. Someone once told me . . .” She paused, her gaze turning distant and slightly unfocused. “Someone told me that Occam’s razor should never be used to end an argument, only to begin the search for truth. I think . . . it may have been my father.”
