The Japanese language has two sets of alphabets with same phonemes (sounds). I always thought it would be good to have a tool that would show the three-dimensional aspect of this sound/alphabet system rather than have two separate charts. One night, I had a dream about this tool and proceeded to sketch it and had it made in North Carolina . The tool comes with a little booklet on how to use it. I have taught the phonetic system in 2 to 4 hours using this tool (2 hours for high school students). Retail price: $15.95.  Online discount available.