Day sales are usually where the market’s real temperature is taken—where trends sharpen and the middle market either holds or crumbles. On Thursday, Christie’s Post-War and Contemporary Art day sale brought in a healthy $88.7 million,…

Day sales are usually where the market’s real temperature is taken—where trends sharpen and the middle market either holds or crumbles. On Thursday, Christie’s Post-War and Contemporary Art day sale brought in a healthy $88.7 million,…