Achilles G. Rizzoli (1896 - 1981), anonymous during his lifetime, has since his death become celebrated as an outsider artist. He is an unusual example of an "outsider" artist who had considerable formal training in drawing.

Rizzoli lived near San Francisco, where he was employed as an architectural draftsman. After his death, a group of elaborate drawings came to light, many in the form of maps and architectural renderings that described an imaginary world exposition (much of which was designated "Y.T.T.E.," for "Yield To Total Elation"). The drawings include "portraits" of his mother (whom he lived with until her death) and neighborhood children "symbolically sketched" in the form of fanciful neo-baroque buildings. Some of the buildings commemorated events in Rizzoli's life, including his first glimpse of a vagina at age forty.