This is a look inside an extraordinary instrument. Roger Manin's Selmer Balanced Action Sax from the 1940s. It had just been carefully refurbished by Neige Music Atelier in New Zealand, with Italian Pisoni Pro pads with metal resonators.
Typically closeup macro shots like this have a very shallow depth of field. To keep it in focus from from to back I took 47 photos, moving the focus ring slightly each time, and ran them through some special software to combine just the sharp parts of the image. The result appears cavernous. The apparent size is an illusion. It's essentially the opposite of the tilt-shift-miniature effect that tricks us into thinking large scenes are small.
I Photographed it on a Lumix S1R with a Laowa 24mm probe lens.