Gravilux lets you draw with stars: it's a combination of painting, animation, art, science, and gaming. As you touch the screen, gravity draws simulated stars to your fingertips. You can tease and twist the particles into galaxies, explode them like a supernova, or color the stars by their speed. Move the mouse to the bottom of the screen to change parameters including gravity, antigravity, number of stars, star size, and color. Gravilux was first released as a work of interactive art by Scott Sona Snibbe that was only available in galleries and museums. The award winning app for iOS is now available for Mac based on the same code.