You're welcome.
The most engaging game I've played recently is Portal. Unique, and fresh. Looking forward to Portal 2.
Let me just point out that there is something ironic in your opening statements.
I'm sure it's my mathematics background, but when I saw the headline I assumed the author would be discussing something involving the square root of negative one, to which my response was, "Silly author, you can't visualize four dimensions. (Sober.)"
You have a mathematical background and can not visualize four dimensions? Here is how you do it: Just visualize the problem in n dimensions and then set n=4.
It's a Slashdot user with a 2 digit user ID, they're very rare.
You might say there's less than a hundred of them left in the world today!
And they don't breed.
If you want to put yourself on the map, publish your own map.