Here's a look at a few more of the masterpieces now on display at the Art Gallery of Ontario in Toronto.   These abstract, expressionist works are on loan from New York's Museum of Modern Art. For more background, click here:   Adolph Gottlieb, who died in 1974, is responsible for this work.     Willem de Kooning's deep concern about violence against women is manifested in this painting, simply entitled "Woman I."   "The turmoil seems so real," says Matthew Teitelbaum, the AGO's director and CEO. "That's de Kooning's world."   One of de Kooning's paintings recently sold for $120 million.   For a more detailed look at this painting, click here: This painting is Joan Mitchell's "Ladybug," done in 1957, and so named because of the way the paint "flits" across the canvas, as if it were the surface of water. Mitchell was influenced by Monet's water lillies. She also lived with Jean-Paul Riopelle.    For a more intense look at the painting, click here:   The two men most responsible for making this show happen will discuss the Ab-Ex next month at a public event.  More details are here.