In addition to Tessa or Tess, I often go by the handle tessaract (on AIM, twitter and quite a few other places). I do a few different things to earn income. First and foremost: I design. I'm trained as a graphic designer/commercial illustrator. As a kid, I wanted to airbrush rock album covers, movie posters and sci-fi book covers when I grew up (Yes, you read it right: album covers. I'm that old. And I may grow up yet!). I also program in a few scripting languages and when I can, I like to share what I know via writing posts, articles and books.
Most recently in the past few years, I've moved over to full OOP programming of not only Flash-based and AJAX web apps, but desktop and mobile apps as well (Not very rock album cover-y, but pretty cool none-the-less).
So, What's a Tessaract?
A tessellation or tiling of the plane is a collection of plane figures that fills the plane with no overlaps and no gaps -- wikipedia.org
I've liked the word "tesseract" ever since I read Madeleine L'Engle's A Wrinkle In Time as a kid. The term is actually "tesseract" and while Madeleine used it to describe a type of time/space/warp portal, it is actually a hypercube or tetracube (hence the name of my LLC: hyper3media pronounced: hyper-cube-media). Yep, I spell tesseract incorrectly, on purpose, to have my name in there: tessaract.
"Tess" is a greek root that relates to the number 4. My name for example is Greek for "fourth born". A tesseract is a 4-dimensional cube as we discussed and tessellation is the tiling of squares or things with 4 sides (like old-school desktop wallpaper), you get the picture.