If I had to name one returning theme in all my projects, it would probably be perspective. I like manipulating perspectives, and creating illusions. In most of my work, I either create a perspective that is not there, or I emphasize an environment by capturing its perspective.
Other than that, my work is pretty diverse; I am a panorama photographer, I use projections to create illusions, I write software to view and manipulate perspectives, and from time to time I dive in to making actual physical things.
Have a look around, and check back later. I have lots of past projects I still need to write about, and I have no plans to stop coming up with new plans any time soon...