Scientific glass is a genre of glass pipes. Most pipes can be labeled either scientific or heady, with a spectrum running between them (the more scientific, the less heady). Heady glass focuses on embellishments, using diverse and vibrant glass colors, eye-catching marbles, and glass structures on the outside of a pipe that don't contribute to the pipe's function. Heady pipes often take on recognizable forms, like an animal, a face, a robot, etc. Scientific glass focuses much more on function, largely through the use of percs. Scientific glass encompasses a large variety of percs applicable to a wide array of pipe formats. Scientific glass is usually clear, in part to reveal the inner mechanics of the pipe. This genre of pipes gets its name from the tradition of glasswork used in chemistry sets and medical devices. Most GRAV® products can be characterized as scientific.