Compact discs (CDs) are a form of media used to display cartoons, or educational films on a computer. They work like a zoetrope, with hundreds of tiny, semi-transparent pictures. When a light is shined through them, they are enlarged and projected onto a computer sceen. When the disc is spun, this creates a moving image.
Sound is provided by a tiny undulating groove that runs parallel with the pictures, and is read by a small needle inside the CD drive assembly. In many budget CD drives, this needle is made from baby's hair.
The limitations of this technology can be used to explain why many albums get worse after the first few tracks, and why films become boring and inept after the first six minutes of continuous unconvincing CGI.
All content copyright Tom Crowley