In the last 3 years I have become fascinated by ambigrams, and they often takeover my sketch pad. An ambigram is a word that can be read forward and backward, like the Nine Inch Nails logo. I especially like the Blacksmith logo designed by John Langdon
and all of the Angels and Demons ambigrams, I believe also done by John Langdon. While searching for ambigrams I noticed that Dan Brown's book is being made into a movie and it's being directed by Ron Howard. Should be a good one.
Earth Air Fire Water by John Langdon
Illuminati by John Langdon
And here are a few that I have made in the last couple years.
This post was inspired by one of David Airey's posts on ambigrams at Logo Design Love