Paul Rozin, a professor of psychology at Penn, found that people are reluctant to drink from a glass that contained a plastic cockroach. What would happen if people ate from a plate with a drawing of an insect?
Piatti sporchi = dirty plates. From a 2008 food design competition in Turin. (English description here.) The plates have pictures of a fly, a hair, a beetle, and a lipstick smudge. In a mass-market version, you could have a choice of insect sizes to control the amount of repulsion.
The competition was open to anyone. Most of the 50-odd entries were from students; a few were from professionals. This entry was from Sayonara Rush Design.
Thanks to Francesca Zampollo.