This design, by Lydia Rivlin, was used for an academic conference poster and book cover. Apparently it caused some controversy. About its design, Lydia says (personal communication, 16 Aug 2006):
“When I had to think of something to illustrate the idea of formal (i.e. mechanical) and applied practical reasoning, this image of a robot chatting up a prostitute sprang straight into my mind. […] I have an idea he is asking her how much she would charge for an oil change – but I could be wrong.”