By the end of the 1980s, many people were dying. Drugs took some. AIDS took others. And gentrification, which arrived on the coattails of art, was eating away at Loisaida and pushing its residents out. Mr. Wong’s art, which always feels lonely, became lonelier. In 1985 and 1986, he painted a remarkable series of life-size trompe l’oeil pictures of shuttered and padlocked storefronts, and called an exhibition of them “The Last Picture Show.”