The Id, ego, super ego in I

this is a psychology oriented swap. Postcards can be homemade or purchased. the postcard should have something to do with the mind. try to think broadly.... a magic eye picture, brains, dendrites, electrical signals, addictions, personality, psych terms, (weird) phobias, gender, fetish, split brain surgery, violence on television and children's behavior, Pavlovian Conditioning, Sigmund Freud, humanism, etc.. Let your minds wonder.. swappers must send 1 postcards to each of their 3 partners.