. "Ydriej"@en . . . . "Ydriej"@en . . "Ydriej was a planet, the home of a civilization where the populace rebuilt their culture using photonic energy, essentially making their lives in one big holodeck. (TNG novel: Q & A)"@en . . . "Ydriej was a planet, the home of a civilization where the populace rebuilt their culture using photonic energy, essentially making their lives in one big holodeck. (TNG novel: Q & A)"@en . "planet"@en .