Authentic portraits and real photographs from Wikimedia Commons and Unsplash. Photographs accompanying ideas and dilemmas are contextual illustrations. Images are resized, converted to WebP, and may be cropped to fit the layout. Each image retains its original license, including the same share-alike license for any adapted image.

Ancient marble bust of Aristotle
After Lysippos

Portrait of John Stuart Mill, circa 1870
London Stereoscopic Company

Portrait of John Rawls, 1971
Alec Rawls / Belknap Press of Harvard University Press

Photograph of Carol Gilligan
Deror avi ; cropped by User:Ravit

Historical painted portrait of Immanuel Kant
Johann Gottlieb Becker (1720-1782)

Portrait of Jeremy Bentham by Henry William Pickersgill
Henry William Pickersgill

Portrait of Robert Nozick, 1977
Libertarian Review

Photograph of Derek Parfit at Harvard, 2015
Anna Riedl

Portrait of Garrett Hardin, 1959
Kate Dole

Bookshelves in the San Diego City College library
Joe Crawford from Moorpark, California, USA

Sunlit path through an evergreen forest
Loren Cutler

Railway tracks running through autumn trees
Unsplash contributor

Wooden chess pieces on a chessboard
Alexei Maridashvili

A stethoscope on a wooden table
David Ernesto Canto Chay

Waves rolling onto a sandy coastline
Mario Amé

The Lady Justice statue above the Old Bailey
Philip Halling

A real violin photographed from the front and side
Just plain Bill

A person using a virtual reality headset at the European Space Agency
European Space Agency

An open Gutenberg Bible at the New York Public Library
NYC Wanderer (Kevin Eng)

Two people shaking hands
Rufino

Peter Singer in 2017
Ula Zarosa

Restored historical portrait of Henry David Thoreau, 1856
Benjamin D. Maxham; restoration by Scewing

Three surveillance cameras mounted on the corner of a building
Hustvedt

Dairy cows grazing in a green pasture in Ireland
Martin Abegglen

Donner Lofts affordable housing building in San Jose, California
Will Buckner

People carrying placards at a protest in London in January 2022
Alisdare Hickson

The wooded shore and reflective water of Walden Pond in 2010
ptwo

Volunteers preparing food packages at the Daily Bread Food Bank in Toronto
US Mission Canada