The Crystal Cathedral

The word cathedral is derived from the Latin word cathedra ("seat" or "chair"), and refers to the presence of the bishop's or archbishop's chair or throne. In the ancient world, the chair was the symbol of a teacher and thus of the bishop's role as teacher, and also of an official presiding as a magistrate and thus of the bishop's role in governing a diocese.
Though now grammatically used as a noun, the term cathedral was originally the adjective in the phrase "cathedral church", from the Latin ecclesia cathedralis. The seat marks the place set aside in the prominent church of the diocese for the head of that diocese and is therefore a major symbol of authority.