Euler’s identity - this would make a beautiful pointillist tattoo.

Euler–Lagrange equations and Noether's theorem . "The cool thing is that this way of thinking about physics has survived some major revolutions in physics, like quantum mechanics, relativity, etc.

deceptively simple crop formation: the horizontal bars can be decoded using ASCII and contain a reference to Planck’s constant, a foundation stone of the quantum physics that allows us to understand the weft and warp of our energetic universe.