This image, captured using Schlieren imagery, depicts hot air from a lighter moving and getting displaced by a 3D printed airfoil. My teammates Duncan and Domenic helped with the setup, lighting, and positioning of the airfoil. The original setup was vertical, but I have rotated the image 90 degrees counterclockwise to represent the physical setup of a real airfoil. The light-to-dark gradient from the top to the bottom of the airfoil shows a density gradient that is consistent with airfoils where hotter, less dense air moves above. Brighter light is bent away from the knife edge, which means that density decreases in that direction, which in turn means that the darker areas of the image will show high-density air.