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Interior view of the Paris Observatory, showing a large hall with arches, chandeliers, a fireplace mantel, globes, and display cases. The Paris Meridian passes through the axis of this gallery. Printed text at the bottom: 'Interior of the Paris Observatory built from 1667 to 1671 under Louis XIV according to the plans of Perrault' and 'Paris Observatory The Paris Meridian passes through the axis of this gallery'.