More drawings for my sister, this time of several different types of abacus… Several purposes for these eventually, including some tutorial documents and a custom brochure. If I figure out a way to use them in anything else, I will of course!
For a little background, the abacus is a very old-school mathematical device. For those who know how to use one properly, you can do some fairly complicated calculations very quickly. Most of these illustrations are modeled after official designs, with that last one an illustration of a kind that you might make yourself from craft beads and popsicle sticks!
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