DotArt where and with what do they eat?

Question

Design

Good afternoon dear!
I am fond of the so-called "Lettering" and I was interested in a style like dotart. Those. a picture or a word consists entirely of dots. Only the density of dots per square centimeter changes. Can you point me to some resources on this topic? The order is: 1. services 2. communities 3. books if nothing else.
As always, many thanks to everyone!