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The Vulcan Learning Center was an educational site. There, Vulcan children stood in skill domes that displayed information, and would answer automated questions.
It was the site of the thirty-fifth attempt by a group of bullies to elicit an emotional response from Spock. When the bullies succeeded, Spock pushed one of them into a learning pit and physically assaulted him. (Star Trek)
A learning pit was constructed as a set against a greenscreen backdrop. (Star Trek gag reel)