Shown is an F1 car which was coated in a UV solution then sent around a racetrack. As seen, flow lines developed along the car body and we can distinguish areas of high and low pressure, providing a physical method of analyzing the car’s aerodynamics.
Photo credit to the Red Bull F1 team, image link below.
Second place. I liked the idea of this picture especially the idea of treating it as a way to analyze the aerodynamics of the car which makes it useful!