Posy is a very inspirational youtube channel covering various random topics and phenomena in the context of computers, hifi and other forms of media.

The most recent video "Dots" is about the various halftone-patterns found in print. Some other favorites of mine include the video about "Terragen Classic" (an old piece of software to render landscapes) and his video about the design of segmented displays. Both are linked below:

• Ancient (software)
• Segmented Displays