Two Dogs Fighing: Man Chasing Dog (1939-42) Image courtesy Christie's. “Outsider art” may not always be easy to define, but demand has never been broader or more intense, according to Christie’s specialist Cara Zimmerman. Featuring 90 lots, yesterday’s online “Outsider and Vernacular Art” sale pulled in just over $2 million. That total cleared the $1.57 million presale high estimate, with a strong sell-through rate of 97 percent sold by lot and 99 percent sold by value. The auction included selections from the William Louis-Dreyfus Foundation, sold to benefit both the Foundation...