I found two of these plates at the Goodwill years ago. They hold an electric, magnetic charge. They were the Amherst College dining hall plates into the 1970s. Into the 1970s. It is a dark, rueful pleasure to use them. Memento mori.
Photo from: Peter d’Errico, “Jeffery Amherst and Smallpox Blankets: Lord Jeffery Amherst’s letters discussing germ warfare against American Indians,” 2001, 2019. Accessed on October 19, 2019, at https://people.umass.edu/derrico/amherst/lord_jeff.html