Here's Warhol again with the seal on the soup can mimicking a pop cap in the composition.
Something I didn't even notice until I'm posting this (and I went into my kitchen to check a tomato soup can), but the O in soup is tilted like the O in Robert Indiana's "LOVE" (but in the opposite direction). I've read so many interpretations of that tilted O, but wouldn't credit any that didn't come from the artist himself. Sometimes I think that those making a career out of art criticism come up with interpretations and meanings that the artist never thought of or intended. I can think of as many reasons why an artist would not refute any of these and is the wiser for remaining mute.