Why do brass instruments have curves

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.

In "thirty are better than one" 1963 by andy warhol describe to what degree this image depicts rhythm or pattern

What characters are in marvel super heroes vs street fighter