Captain Picard confronts a Koinonian in a recreation of the Aster front room.
The Aster home was a house on Earth in which Marla Aster, her husband, and their son Jeremy lived in the late 2350s before Marla was assigned to the USS Enterprise.
The Koinonian doppelganger, who was intent on comforting Jeremy after the death of his mother, created a simulation of his house on Earth aboard the Enterprise. (TNG: "The Bonding")