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Calculating-Table by Gregor Reisch: Margarita Philosophica, 1503.

The woodcut shows Arithmetica instructing an algorist and an abacist (inaccurately represented as Boethius and Pythagoras).

A play by Alexis from the 4th century BC mentions an abacus and pebbles for accounting, and both Diogenes and Polybius mention men that sometimes stood for more and sometimes for less, like the pebbles on an abacus.

The upper deck had two beads, and the bottom had five beads.