Music is just layered simple patterns and our brains LOVE IT.
Sound is pressure waves, musical notes are a specific pattern of pressure waves. Melodies are repeated musical notes. Songs are repeated melodies following standard structure.
Our brains love trying to decode and parse all these overlapping patterns.
Maybe not really a shower thought and more wild speculation.
Polyrhythms and polymeters are still patterns. They’re often harder to perceive and follow than your typical 4/4, but we’re still searching for the beat and bobbing our heads to the complex patterns it creates.