Ambigrams are cool. Palingrams (which is I think the correct description of a palindromic ambigram) are cooler. The company we use for our internet hosting and Content Management at work has a palingram for a logo. I saw it at a conference I went to but haven’t found it online or I’d include it here.
Anyway, Ambigrams are cool. Shirts derived from popular novelty shirt concepts with mirror image antonymic ambigrams are cooler. Like this one. From neatorama. It’s clever. Or stupid. Depending on your perspective. It’s also cheap at $US10.