Amazing Facts About Playing Cards

There are 52! (52 factorial) ways to arrange a deck of cards — roughly 8 followed by 67 zeros. That number is so large that every time you give a deck a proper shuffle, the exact order you end up with has almost certainly never existed before in the history of card playing, and almost certainly never will again.

American "cardstacker" Bryan Berg holds multiple Guinness World Records for freestanding card structures — no glue, tape, or adhesive of any kind, just cards leaning on cards. His tallest stands over 25 metres, built from tens of thousands of decks stacked into a working scale replica of a building.

The oldest complete hand-painted European deck known to survive is the "Cloisters Deck," made in the Southern Netherlands around 1470–80. All 52 cards survived intact and are now held by The Met Cloisters in New York — a genuine 550-year-old deck you can still go and see in person.

In the standard English card pattern, the Jack of Spades and Jack of Hearts are drawn in strict side profile, so only one eye is ever visible — earning them the nickname "one-eyed jacks." It's such a well-known quirk that it became poker slang of its own, naming a wild-card variant where those two specific Jacks (plus deuces) are wild.

Every King, Queen, and Jack in a modern deck is printed "double-headed" — mirrored top and bottom, so it reads correctly no matter which way up you're holding it. That wasn't always the case: early European court cards were single-figure, full-length portraits, and you had to physically turn the card around to see it properly. Double-headed printing became the standard during the 1800s, purely for the convenience of not having to reorient your hand.

Early playing cards had sharp, square corners. Card makers rounded them off starting in the late 1800s for a genuinely practical reason: square corners chip, fray, and pick up dirt fast with regular handling, and a rounded corner simply lasts longer and slides more smoothly out of the box — a small manufacturing tweak that became permanent.

Most of the world plays with "Poker size" cards (2.5" × 3.5"), but a slightly narrower "Bridge size" (2.25" × 3.5") has been the traditional choice for Bridge and other games where players fan a lot of cards in one hand — the narrower width means more cards fit comfortably without your hand feeling like it's about to burst.

Long before Tarot cards were associated with fortune-telling, they were simply a trick-taking card game called Tarocchi, invented in 15th-century Italy and played socially, much like Bridge. The mystical, divination-focused use of Tarot only emerged in the late 1700s in France — over 300 years after the cards themselves were first shuffled purely for fun.

Ask for a "deck of cards" in the United States or Australia and everyone knows what you mean. Ask a card player in the United Kingdom, and you're just as likely to hear it called a "pack of cards" — both terms describe exactly the same 52 (or 54, with jokers) cards; it's purely a difference in regional English, not in the cards themselves.

Card counting in Blackjack — tracking which cards have already been played to estimate the odds on what's left — is just mental arithmetic, and no law bans a player from doing maths in their head. Casinos, however, are private businesses and are generally free to refuse service to anyone they suspect of counting, which is why skilled counters have been quietly (and sometimes not so quietly) shown the door for decades.

During the Second World War, British intelligence worked with a playing card manufacturer to produce decks with silk escape maps hidden between the front and back layers of each card, smuggled into POW camps disguised as ordinary games and care packages. Soaked in water, a card would peel apart to reveal a printed map — a genuine piece of card-based spycraft, not a legend.

"Cardistry" is a modern performance art and competitive discipline focused entirely on flourishes, cuts, and one-handed manipulations with a deck of cards — no actual card game is ever played. It has its own global competitions, sponsored professionals, and dedicated online communities, all built around making a deck of cards look as impressive as possible in someone's hands.