Esophagus and Colon Function Room Open on 21st Street

On 21st Street near Guerrero Mission Local finds these bizarre signs in a second-story window. We are naturally curious, even though this town is full of loony birds holed up in such aeries with batshit messages in their windows. Were these just recycled signs? Some sort of art project? Is there actually "no entry" allowed in this breast, esophagus, and colon private function room? Are private functions occurring in someone's colon here? Please advise.