The cubes came with a fourteen-page booklet too. Take a look at the colorful information included in the manual:
What's with that "tonal" mumbo-jumbo (on the page shown at the left)? What could that mean? These cubes produce no sound that I can create with them. They do "clack" if you hit two together -- but I cannot figure out how they "generate sounds which are tuned to the basic harmonic intervals."
"Each axis produces a distinct pitch"? Huh? How? They're are just solid lucite cubes.
Is there a musicologist out there who can help me decipher all of this?