Complex sentence: "Spiegel im spiegel" in German means literally "mirror in the mirror", referring to the infinity of images produced by parallel plane mirrors: the tonic triads are endlessly repeated with small variations as if reflected back and forth.
Split into simpler sentences: Spiegel im spiegel in German means "mirror in the mirror", referring to the infinity of images produced by parallel plane mirrors. The tonic triads are endlessly repeated with small variations as if reflected back and forth.