One Little Rock - Missoula, Montana

"Looking at numbers as groups of rocks may seem unusual, but actually it's as old as math itself. The word "calculate" reflects that legacy -- it comes from the Latin word calculus, meaning a pebble used for counting. 
To enjoy working with numbers you don't have to be Einstein (German for "one stone"), but it might help to have rocks in your head." 

- Steven H. Strogatz, The Joy of x: A Guided Tour of Math, from One to Infinity