In the Gizmo warm-up,on STIMULATION, people begin to move around the room, after a while and after a person visits the buffet table, the person is likely to turn green,then overtime,the number of the green people increase.
When a person changes color on stimulation,the person's color change means/indicates that the person has been infected with a disease.
The color green further indicates that the disease the person is infected with is a food-borne disease.