First released in 1984 and invented by the engineering lecturer, Alan Adler, the Aerobie differed from the traditional Frisbee in that it wasn't a solid disc - instead it was a ring that was hollow in the middle. Not only did this innovative design make the Aerobie far lighter than the Frisbee (because the design caused it to have less drag), it was much easier to throw the Aerobie in a straight line. This was helped along by the disc's innovative inner rim spoiler.
