A page that turns differentlySourced
Some old books contained rotating paper calculators
A volvelle uses rotating paper components to align information. Early examples appeared in astronomy books, helping with calculation and organizing data. Rather than simply reading a page, a user moved parts of it to explore the information. Paper could become an analog tool.
The page had moving parts as well as printed words.
Summary / translation: Unbubly · CC BY-SA 4.0
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Volvelle · Wikimedia contributors
Adapted, summarized and translated from the source. Adapted text is also available under CC BY-SA 4.0.
Reviewed: 2026-10-05