They are, in short, artists. It's not something that you can just program into a computer. These people are exceedingly creative folks. To understand the difference between analog and digital forms, think about time.
Time is analog, which means that it moves continuously.
And that's also the way a computer chip works, viewing all information as ones or zeros, depending on whether electrical current is on or off. A typical example of how analog technology is used is in cell phones. The human voice and other sounds are analog, a con tinuous range of pitches, from high to low. Since people can't hear a digital signal as an intelligible sound, the signal must be converted back to an analog sound so it can be recognized at the other end. Crafting a chip that can do such conversions requires a special touch, and the ability to do it is passed on from master to apprentice, as in the craftsmen's guilds of the Middle Ages.