" For with each bite he tasted not just the irresistible sweetness of the dessert, but the deliciously agonizing negative flavor of all the imagined foodstuffs that he could have bought with that nickel instead—a turkey leg the size of his forearm, or a milkshake with a pair of deep red strawberries floating on its surface. The single relinquished nickel sat in the custard seller's till, its gold transmuted back to lead. "

― Dexter Palmer , The Dream of Perpetual Motion