Synesthesia through sound and sauna

In a good sauna, heat and steam create something close to synesthesia: the neurological phenomenon where one sense triggers another. You don’t just feel heat; you absorb it like music. Good heat is a wall of heat,¹ a nod to Phil Spector’s Wall of Sound: dense, bombastic, immersive. Steam off the rocks can land differently depending on where you hit it, different places on the steel drum² delivering different notes.

The jazz trio of heat transfer in the hot room:

• drums are conduction, direct heat transfer to the rocks and then through bench and body.
• horns are convection, heated air carrying motion and direction.
• bass is radiant heat, deep, penetrating, and a consistent expressive bass line.

When these three are in balance³, sauna stops being temperature and becomes great music, a synesthesia of sound. 

Concert halls spend enormous time and money engineering for good sound, carefully shaping how sound waves move through space. Producers, like Phil Spector, recognize that all instruments are good, and contribute to each other. The art comes with mixing them to make a song sound great, and a sauna to heat well. Designers aim for smooth, laminar movement of sound energy. Lazy river slow currents without vortices, so clarity is preserved rather than scattered. In parallel, lämpömassa (thermal mass) stabilizes the room by absorbing and releasing heat slowly, ensuring that both sound and temperature move deliberately, not chaotically.

¹ Wall of heat was first shared by thermal enthusiast Jeff Pyzyk around 2020, when his music playlist algorithm drifted into some lame country shit, and I happen to be there for it.

² “Different steam like different places on a steel drum” was also coined by Jeff Pyzyk as he celebrated making löyly with the Banya Addition of his Kuuma Low Profile stove, 2023.

³ “Heat transfer isn’t about one being better than the other” as detailed by Grant Whittle, during one of his extensive treatise on heat, thermal behavior and the art of sauna appreciation.