Every three months, the enormous enamel blackboards at Lark on the Park are wiped clean, and artists come in to create a fresh set of chalk drawings. They have 36 hours to complete the task. In return, each artist gets a $1,000 credit at the restaurant, which sits across the street from Klyde Warren Park. Kevin Sloan, an architect, has done three pieces at Lark. His current drawing, Pegasus and the Twister, depicts the deadly tornado that tore through Dallas in 1957. In Sloan’s piece, it looms over the downtown Magnolia Building, which is topped by Pegasus. Each of his drawings for Lark has shown iconic imagery from the city’s past. “I think architecture is an intrinsically profound thing,” he says, “and it contains with it not only how we build the world around us, but memories and moments in time.”