PIA MATER

THE VOLVELLE.

STATUS · DISPENSED

A paper volvelle: printed discs pinned at the centre, turned to find an answer.
VOLVELLE · 13061 · RAMON LLULL, ARS GENERALIS · A PAPER COMPUTER

We have changed the material and none of the reasoning.

THE VOLVELLE on the PIA MATER website: a wheel with three holds for top, bottom and shoe.

One of the earliest known volvelles is in Ramon Llull's Ars Generalis, 13061. Turn the discs and the paper answers the question.

  1. 1 Jessica Helfand, Reinventing the Wheel, p. 19.

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Turn the wheel.

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