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Parsing the iconography of The Rock/Dwayne Johnson--a guy who's as comfortable at Make-a-Wish Foundation fund raisers as he is on the Howard Stern Show--is a task worthy of a French semiotician. He represents the postmillennial celebrity--a simulated character overlaying other simulated characters. This is The Rock's secret and perhaps ultimate persona: the Onion. Let others peel away the skin to find another skin beneath. Just ensure that every layer is as tasty as the one before and America will cry for more.