Polly wants a cracker, but the expected cracker turns out to be a firecracker.
Grawlixes appear as stars, swirls and censorded (blanked) curses.
A silent film.
Grawlixes like stars and spirals do not replace sound. (see; programming with grawlixes).
However;
Most Grawlixes seem to have disappeared from the movies with the introduction of sound.
therefore it is likely that;
A. Grawlixes must have some relation with language
B. But not with spoken language