This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Golden canon of page construction.svg Synthesis of Tschichold's Fig golden canon of page construction using the diagonals and relationship illustrated by the circle and Fig Rosarivo's equivalent construction the division into ninths both rely on page and type area ratio of see north londonmet ac uk htm Tschichold chapter online