[iainmerrick]

I'm very surprised they don't make the sitting/hanging notes semicircular, so they're much more visually distinct (like stalactites and stalagmites).

Instead they seem to have tried two different systems for the sitting/hanging notes, both of which look very hard to read to me: https://clairnote.org/clairnote-dn-clairnote-sn/ (although as you say, if you already know traditional notation it's hard to look at this with an unbiased eye).