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Human knot
A human knot is a common icebreaker game or team building activity for new people to learn to work together in physical proximity.
==Information==
It is a disentanglement puzzle in which a group of people in a circle each hold hands with two different people who are not next to them, and the goal is to disentangle the limbs to get the group into a circle, without letting go of grasped hands. Instead, group members should step over or under arms to try to untangle the knot. Not all human knots are solvable and can remain knots or may end up as two or more circles.〔http://mathlesstraveled.com/2010/11/19/the-mathematics-of-human-knots/〕
An easy way to ensure that the game will end up with a single circle with no nodes is to start from a circle of people holding each other hand, looking all towards the center of the circle, and ask some of them to cross his/her arms and swap his left hand with his right hand grasping again the same neighbors. When the game is successfully completed a certain number of people will look outside of the circle. This number equals the number of people having crossed arms. The challenge is to solve the game several times starting each time with an increasing number of crossed people. The game is recommended for children from 12 years and up. Optimal number of people is 7 to 200 (group sizes of 10 are ideal). No materials are required. It is designed to build team work and problem solving skills, while serving as a fun icebreaker.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Human knot」の詳細全文を読む
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