Physics-related tattoo ideas :D So, I'm starting college in March - to major in Astronomy - and, as a tattoo lover, I'd like to represent my obsession over Astronomy and general Physics by getting a tattoo, as it has changed my life in many ways. Thing is, I'm out of ideas. I am thinking of getting it as a birthday gift - I also turn 18 in March -, so any suggestions would be really appreciated. I was thinking of getting something related to gravity, as I think it's a beautiful and fascinating thing... Any formulas (I bet there is a obscure/more complex formula for gravity my high schooler self is unaware of - Kepler's won't do the trick), drawings, anything? Thank you :) P.S.: I'm sorry if there are any spelling mistakes or something like that - english isn't my primary language!