Pi Pattern Black iPhone 5 Cases Posted on 2012/12/09 by admin You have a problem, you need a new case. The answer is Pi. Be a cool nerd with this awesome Pi design. Don't forget that March 14th is National Pi Day. Click Customize it! to change the background color from white to some other color. product tags: pi day, geek, nerd, science, numbers, math, 314, mathematical, constant, funny, perimeter, greek, calculus, funny chemistry sayings, college,