Technically any round thing that's considerably taller than it is wide is phallic. I've heard people call obelisks phallic on more than one occasion and they're not even round.
Sure, it's a stretch, but it nearly always is. Sometimes a cigar is just a phallus. ... I mean cigar.
EDIT: I'm having suspicions that HN is trying to prevent me from using the more obvious word for the male dangly bit. If this comment ends up dead, that's probably why.
