A special exhibition at the McMullen Museum of Art through July 22 focuses on Belgium’s contribution to modern art between 1890 and the onset of World War II through 53 works, mostly new to North America, from the Henry and Françoise Simon Collection. Below is The Accordion Player (oil on canvas, 53.1 X 47.2 inches), by the Flemish painter Gustave de Smet. The show is curated by fine arts professor Jeffery Howe.