Design based on the Tesseract theme by Tyler Moore.

Talk photographs: Ghent by Giles Laurent (CC BY-SA 4.0); Gottingen by Foreade (CC BY-SA 4.0); Nijmegen by Michielverbeek (CC BY-SA 4.0); Rijeka by moarplease (CC BY 2.0). Yale image in the public domain by Carol M. Highsmith.