A young Max Planck standing at a lectern. He is in his early to mid twenties, wearing a dark jacket that is buttoned high, a white shirt, and a black tie similar to a bow tie. Planck has thin-rimmed glasses and a substantial mustache.There is an equation written on the blackboard in the background.
https://files.mastodon.social/media_attachments/files/110/248/831/214/471/536/original/3603025147ec91e3.jpeg