Window of Dreams
The "Window of Dreams" was the Lokirrim name for a pulsar cluster in the Delta Quadrant known for its electromagnetic fields, which would create beautiful harmonic sounds when they vibrate against the hull of a ship. 

In 2377, Captain Ranek showed the Window of Dreams to The Doctor, inhabiting Seven of Nine's body, during a romantic situation. He noted that "you could travel from one end of the quadrant to the other and not see anything like it" and that it was "the most beautiful sight in the sector." ()

Dal R'El once told Gwyn about the Window of Dreams while he was in detention at the Tars Lamora prison colony. He called it "the most beautiful thing [he'd] ever seen." ()
de: Fenster der Träume
Clusters