Marco,

[you wrote]

> Well, "never" is a very long time.
>
> There was at least one such script. Each syllable was composed by
> horizontal lines, representing the place of articulation (labial, dental,
> velar, etc.), crossed with vertical lines, representing the mode of
> articulation (fricative, occlusive, etc.).
>
> The script was used some twenty years ago by an Italian school child to
> write secret notes on his diary. Some samples of the script might still
> exist somewhere in my dad's garage. :-)

[mariano]

So, I understand the system was/is (a.) syllabic and (b.) complete,
including all relevant articulatory features?

It is interesting, I havent thought about a syllabic writting system
of that kind.

What about a writing system based in the (Jakobson's like) acoustic distinctive
features of the fonems as elements for the symbolic representation?
I would be much more interested in that or something near that, particularly
if some iconicity were intended.

Yours cordially,
mariano