Garrett Lisi explains his "beautiful theory of everything" in this TED talk (h/t: S at Explicitus Est Liber), where each subatomic particle is assigned to a root in the 248-dimensional E8 mathematical structure.
The first remark after his talk was "I probably understood 2% of that, but I still absolutely loved it." I have to concur, but I still wonder: Would getting a tattoo of E8 be an exceptionally geeky thing to do?
(Click to watch a gorgeous video clip of the E8 rotating.)
It's like looking into a kaleidoscope of particle physics, a mandala that represents the universe.
It gives my brain goosebumps.
Lisi's original paper (PDF)
PhysOrg.com "Mathematicians solve E8 structure"