A forgotten oil-on-canvas masterpiece by Indian painter MF Husain, rediscovered decades later, has rewritten the record books for Indian art. Husain’s Untitled (Gram Yatra), a sprawling 14-foot-wide mural, sold for an unprecedented $13.8m (£10.6m) at a Christie’s auction in New York last week. It shattered the previous high for Indian art of $7.4m (£5.7m), fetched...