My first thought was: “oh, that’s an interesting concept, I wonder how hard it would be to learn?”

Then I saw the frequency/time graph, and realised that didn’t seem to have been a consideration at all. This was obviously designed by a sighted person who cared more about what the pictures looked like!

Blind person: “But how do I know which letter is which?” Designer: “Oh, that’s easy! Just look at the picture!”

I love the idea of a sung language, though!