Photo credits

The portraits of famous people on the type pages are made from images on Wikimedia Commons. Most are in the public domain or CC0 and need no credit. The ones below are shared under licences that ask for one, so each is listed with its author, licence and source.

We cropped every image and recoloured it in two tones (duotone) to match each personality family. Our adaptations of CC BY-SA images are shared under the same licence as the original.