abelson

What the heck is the "Structure and Interpretation of Computer Programs" cover drawing about?

What the heck is the Structure and Interpretation of Computer Programs cover drawing about? I mean I know what "eval", "apply", and 'λ' all mean, but I'm having a hard time deciphering the rest of the picture. Who the heck is the maiden? Does she work for the wizard? Why the heck is she pointing at the table? Is she pointing at that...