Trionfi (cards) which offers details about the deck and a cursory explanation of how it is played. It likely had a total of 60 cards (four kings, forty pip cards and sixteen trumps). The forty-four plain-suited cards used birds as suit signs and the trumps presented sixteen Roman gods. In two suits, the pip cards are in reverse order as in many of the oldest card games. Two decks from June 1457 seem to relate to a visit at Ferrara of the young Milanese heir of the dukedom Galeazzo Maria Sforza in July/August 1457. Each deck consisted of 70 cards — the
Zener cards the experimenter picks up a card in a shuffled pack, observes the symbol, and records the answer of the person being tested, who would guess which of the five designs is on the card. The experimenter continues until all the cards in the pack are tested. Poor shuffling methods can make the order of cards in the deck easier to predict and the cards could have been inadvertently or intentionally marked and manipulated. In his experiments, J. B. Rhine first shuffled the cards by hand but later decided to use a machine for shuffling. In his book, "The New Apocrypha",