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In the Spanish region of Catalonia, one tradition stands above all others: the building of castells—human towers. Traditionally built during festivals, these multi-tiered structures can contain as many as 10 levels, each composed of people linked together in a circle. This dangerous activity requires teamwork and planning. A tower is only considered complete once the final casteller has climbed to the top and extended one hand with four fingers raised in a gesture symbolizing what? Discuss
Source: The Free Dictionary