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Existing comment: Dining While Reclining:
A formal Roman dining room is known as a triclinium, from a Greek word meaning "three beds." Three couches stood around a small table where the meal was served. Each couch could fit three guests, who reclined on their left sides, so their right hands were free for eating. If unexpected guests turned up, they sat just behind the reclining diners and were known as umbrae, or shadows.
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