This is actually not totally true. Your mind collects different features of other faces you've seen and then makes that something in your dream. But, yes, every face you've seen can be depicted in your dream again, even if you saw them for a split second.
Paneled wood wall art with a bird and typographic motif. Product: Wall artConstruction Material: WoodFeatures: Ready to hangDimensions: 20 H x 14 WNote: All hardware includedCleaning and Care: Wipe with damp cloth