The Arbre version of a Faraday cage[1]: a closed and grounded surface of metal or metal mesh, used to isolate the inside of the cage against electromagnetic waves (radio, etc.) from the outside.

The servitors at the Plurality of Worlds Messal conspire to construct such a Basket around the dining room in order to confront the disguised Jules Verne Durand about his origins and purpose without his minder's knowledge.

  1. Anathem, page 708
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