Again...it's not the law...but anyhow...this brings up a point of interpretation of the code, and a much greater philosophical question. (unless there's more in the code that covers it, and frankly, digging through Title 1 isn't my thing right now.)Funny thing about US flag laws: It is also illegal for the flag to be worn as a piece of clothing. Plenty of "patriotic", redneck asshats do this without a second thought. It's especially funny when it's veterans or members of the active military who like to cause trouble like the Vet in this story.
It is also illegal to hang it off of your car, boat, 18 wheeler etc. Plenty do that as well.
Also shouldn't be carried horizontallya st hey do with those gigantic flasg at NFL games.
US Code TITLE 4 > CHAPTER 1 > § 7
(b) The flag should not be draped over the hood, top, sides, or back of a vehicle or of a railroad train or a boat. When the flag is displayed on a motorcar, the staff shall be fixed firmly to the chassis or clamped to the right fender.
US Code TITLE 4 > CHAPTER 1 > § 8
(c) The flag should never be carried flat or horizontally, but always aloft and free.
(f) The flag should never be used as a covering for a ceiling.
(j) No part of the flag should ever be used as a costume or athletic uniform.
What constitutes a flag? You could take a strict interpretation and say "flag" means only an actual piece of cloth in the specified design and size...which you shouldn't, say, wear as a toga or cut up to decorate something or display horizontally.
By this interpretation, paintings of flags or use of the design of the flag falls under unspecified territory.
But you could also interpret it liberally, to mean the design itself.
It's all a very Jasper Johns question.