There are several murals at a housing development being built in the city of Santa Clara at the San Jose border next to Valley Fair Mall. These murals are by Maxfield Bala Creative mural company (https://www.maxfieldbala.com/).
I love to walk around in bare feet. And I am use to seeing signs that say you must have shoes to enter a place. This, however, is the first sign I have seen that says you must have bare feet. It is on the side of the painted silo.