One concept that is digital is the alphabet. The alphabet was created around 1800-1900 BC. You can distort the alphabet and still maintain the meaning, and there are only 26 letters in the alphabet, which is a fixed number. Shakespeare’s work would also be an example of something digital. His work was from the 1580s to 1613, and they are unchanged as long as you can recognize the letters and words, you can make a copy over a copy. Rembrandt’s artwork, The Night Watch, is not digital, it is analog. This was created in 1642, and it is analog because it uses an infinite number of colors mixed in the painting. Lastly, sheet music is digital because there are only fixed notes. The performance, however, would be analog because it depends on who plays it. It could change, and there are infinitely many ways you can interpret the notes.