If you’ve ever been to a show at Thalia Hall, you’ve walked right past Anna-Michal Paul’s work. She creates the hand-drawn chalk art that greets concertgoers as they ascend the stairs to the second-floor venue. Her detailed, textured portraits and stylized lettering, which she catalogs on Instagram at latenightchalkshow, are as much a part of Thalia’s identity as the musicians who headline the hall every time they come to Chicago. In fact, because she’s created thousands of promotional chalk designs for Thalia, you could argue that she’s its most frequently booked artist.