I wonder what the limits are to such a universal codec. From what I've gathered about synaesthesia (e.g. from V.S. Ramachandran, or Galton earlier), it varies quite significantly between persons. I believe it's said that some 3% of people have aphantasia for instance. That means entire modalities would be excluded for some in a latent space glyph language. Unless, I suppose, one could find ways of stimulating the synaesthetic connections artificially too.