It is really difficult to get a good picture of your back.It's the periodic table of the elements, and the simplicity of its structure is one of my favorite examples of scientific beauty.  Everything in our macroscopic world is made up of stuff in these boxes, and when you line them up by the number of protons like this, their columns (and general location) tell you quite a lot about their physical properties.

Other tattoos:
Just in case you were curious, here is a quick inventory of my ot...