What are some ideas for reflections this the theme is within

To make an etching the artist first coats the entire printing plate with an acid-resistant substance called a made from beeswax, asphalt, and other material. the artist then draws on the coated plate with an etching needle exposing the metal. next the plate is dipped in the plate is removed, the waxy coating removed, and the plate is cleaned, inked and printed.

Which of these is a consistent periodic pulse separated into equivalent intervals of time?

In three to five sentences, list and briefly explain the three elements of music