With contemporary art having become an important investment vehicle for the superwealthy—a profitable and fun place for the rich to park their money—collectors are no longer necessarily connoisseurs. Gouzer is disdainful of the novice client who shows no interest in an artist’s catalogue raisonné, and who wants to know only if the piece he is buying is considered to be in the top ten of the artist’s works. “It’s very much an Instagram way of buying,” he grumbled to me this spring. “You see an image, and you make a decision.” Yet his approach could not be better calculated to appeal to such consumers. Last November, a colleague at Christie’s brought to auction a Modigliani painting of a voluptuous woman, “Reclining Nude,” which had a presale estimate of a hundred million dollars. Gouzer posted an image of the painting on Instagram and offered this unscholarly observation: “Difficult to say which you would want more, the painting for a lifetime or the model for a night?”