'Runciman's puzzle is how to bring together different levels of change and differentiation in human existence - from the biological to the social - under a single analytic framework, one that rests firmly on a Darwinian logic of selection. ... Runciman ... deal[s] ultimately with human freedom or lack of it. Our choices in life are constrained, on the one hand by the physical facts of our place in the natural world given our universal evolutionary heritage, and on the other hand by locally varying institutional facts that determine how our behaviour will be interpreted and judged by those around us. Fires and billboards made from dollar bills put the distinctions suggested by Runciman ... into sharp relief by exploiting physical properties of artefacts while rejecting their institutional properties. ' The Times Literary Supplement