Rarity determined by number of editions (and color):

• 10 pieces in edition of 10 (classic)
• 9 in edition of 9 (classic)
• 8 in edition of 8 (classic)
• 7 in edition of 7 (classic)
• 6 in edition of 6 (classic)
• 5 in edition of 5 (classic)
• 4 in edition of 4 (rainbow)
• 3 in edition of 3 (ghost)
• 2 in edition of 2 (gold)
• Only One as 1 of 1 (special)

Legacy of the Spheres:

Nifty Sax Spheres was one of the first projects (possibly the first) to blind mint single-instrument music as ERC-721 tokens.

It was also one of the first to include rarity metrics in non-generative, human-made music. Minting was at 0.03 ETH, on September 19th, 2021.

Sold-out in less than 12 hours.