Wheels don’t just spin on bikes, buses, and cars…sometimes they are rings that rotate in the pages of old books, that spin and revolve and whirl, swivel and turn to reveal movable messages: decoders, moon movements, or other mysteries.

During the Cambridge Science Festival’s Across MIT Day look for MIT Libraries staff in Lobby 10 from 10am–2pm. Learn the secret of volvelles, and we’ll show you how to make your own takeaway spinning wheel, or coded signal disk.

This event is free and open to the public, and part of MIT Libraries’ Preservation Week event series.