The composition plays with the contrast between the ambitiously-sized sign and the humble, rustic old store. The photo is about shapes and scale.

This is also a bit of a nod to Grant Wood's famous 1930 painting, American Gothic. (See https://www.artic.edu/artworks/6565/american-gothic). Wood's painting was inspired by a grandiose, ornate attic window in an otherwise humble rural farmhouse that Wood happened upon during a road trip. The absurdly oversized, incongruously Googie-style arrow sign here reminded me of that.