So as much as I would love to design one. and if I learn enough about saxophone anatomy. Even though I'm only a highschool student. I have though of a Completely Theoretical Instrument just for fun. So this instrument would be one octave lower than the Contrabass, 2 octave lower than the bari, 3 octaves lower than the alto, and a whole 4 octaves lower than the sopranino. the range would be that of Db 0 to A 2. and I mean since this is a theoretical instrument, for funsies we're gonna say C 0 to A 2. So it has a low A (concert C) Key. There are 2 ways this instrument could be constructed. either probably 10 feet tall, with centralized key systems, but the connecting tubes, or wires or whatever they are called would be wicked long. like some of the ones on the bari. Notably the side Bb, C, and Eb Keys. Those would be stupid long. Or, similar to Benedikt Eppelsheim's Tubax. It could be coiled up and played with a peg, or even maybe a stand to hold it up, but so it could be played sitting down. This is completely theoretical, and not as insane as things such as the Octo Contrabass Clarinet, or Subcontrabassoon. But yeah, just a fun idea, let me know your opinions. Would it be probably pointless. Yes, is it still funny for us low sax lovers. Also yes.