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house of cards
A house of cards (also known as a card tower) is a structure created by stacking playing cards on top of each other. "House of cards" is also an expression that dates back to 1645〔http://www.merriam-webster.com/dictionary/house%20of%20cards〕 meaning a structure or argument built on a shaky foundation or one that will collapse if a necessary (but possibly overlooked or unappreciated) element is removed. Structures built by layering in this way, such as Stonehenge, are referred to as "house of cards architecture", which dates back to the Cyclopean and Megalithic ages.〔Stern, Philip Van Doren,. "Prehistoric Europe From Stone Age Man to the Early Greeks" N.Y. Norton, 1969, p.250〕
== Description ==
The structures created using this method rely on nothing more than balance and friction in order to stay upright. Ideally, adhesives or other external connecting methods are not used, and no damage or alterations are made to the cards themselves. The larger the structure, the higher number of balanced cards that could fail and compromise the integrity of the card building. Professional card stacker Bryan Berg claims, however, that the more cards placed on a tower the stronger it becomes, because the weight of the cards pushing down on the base (increasing friction) allows occasional cards to stumble without the entire structure collapsing. He also claims that proper stacking technique allows cards to function as shear walls, giving considerable stability to the structure.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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