Is Damien Hirst the most powerful figure in the art world? ArtReview magazine’s widely respected list of the Power 100 says he is, but what does such power mean in a highly fragmented age? And more importantly, does the dramatic shift between last year’s list and this year’s edition mean that the art world now moves so quickly that power can no longer be measured as it once was? Maybe, but for the moment, ArtReview’s list still serves as an important harbinger of what’s to come in art over the next year.