The Art of RivalryGenius, friend, rival: this is the story of four pairs of artists whose intense relationships spurred and shaped their art. Matisse and Picasso. Manet and Degas. Bacon and Freud. De Kooning and Pollock. Eight of the most significant modern artists; four pairs linked by friendship and a shared spirit of competitiveness. But in each case, the relationship had a flashpoint, a damaging psychological event that seemed to mark both an end and a beginning, a