The art market has been booming. Museum attendance is surging. More people than ever call themselves artists. Contemporary art has become a mass entertainment, a luxury good, a job description, and, for some, a kind of alternative religion. In a series of narratives, Sarah Thornton investigates the drama of a Christie's auction, the workings in Takashi Murakami's studios, the elite at the Basel Art Fair, the eccentricities of Artforum magazine, the...