Art Basel and the London summer auctions are behind us, and the auction market continues to hit unprecedented peaks. But today’s records and art stars came straight out of yesterday’s headline-grabbing auctions. With that in mind, we take a look back at some major milestones of the last few decades—from the 1973 sale that arguably lit the fuse on the current contemporary market to the recent three-quarters-of-a-billion dollar total of a single evening—to see how these 10 auctions changed the game and perhaps what might happen next.