R. F. Foster, Foster's Complete Hoyle: An Encyclopedia of Games
“ A person who is shown a new game cannot remember all its details, some of which may not have been explained to him even. If he tries to teach it to others while his knowledge is in this imperfect state, he will naturally invent rules of his own to cover the points he has forgotten, or has never learnt, usually borrowing ideas from games with which he is more familiar. ”
