Sotheby’s mustered all of its promotional power in announcing the April design sale of the collection of Jean and Terry de Gunzburg, with a splashy set of social media assets and a weekend feature in the Financial Times. (Nicely done, Jac.) The sale is the culmination of a number of different art market trends: Prominent Boomer collectors are divesting themselves of art and design holdings to avoid burdening their heirs; auction houses are using the name recognition and social cachet of prominent collectors to schedule off-season sales, relieving the gridlock of New York’s congested auction calendar; and design sales are beginning to reach the kinds of values that attract the attention and cashflow once reserved for fine art.