We imagine that photographer Kevin Twomey cringes just a little when he sees crafters on Etsy selling typewriter parts as jewelry. The Bay Area artist prefers to keep the vintage machines he finds intact so he can examine their inner metal workings through the lens of his camera. His series Calculators, which we first discovered on Colossal, started when he was asked to photograph a mechanical engineer’s collection of old adding machines. “The stripping of the external shell of the calculators was not the original concept for shooting these machines,” Twomey explains. “But when Mark removed the covers to show the complex internal working of the calculators, I immediately knew that this was the heart of the project.” Take a closer look at the bones of these complex calculators in our gallery.