“Objects are your best teachers,” Robert Hatfield Ellsworth liked to say. But now that America’s greatest Asian art dealer is gone, many of us recall Bobby, as he was known to his friends, as our best teacher. Collector, connoisseur, world traveler, scholar, author, generous donor and cultural diplomat, Ellsworth was the preeminent force behind the growth of the market for Asian art in the United States from the mid-1960s until his death on August 3, 2014, in New York City. And while he is best known for his passion for Chinese archaic jades, early Buddhist sculpture, calligraphic rubbings, Ming hardwood furniture, Qing monochrome porcelain and modern Chinese painting and calligraphy, he was equally influential in stimulating the fields of Indian, Himalayan and Southeast Asian art. He also loved Japan. Among…