With the rebus, a pictorial sign is used to directly invoke a particular sound of the human voice, rather than the outward reference of that sound. The rebus, with its focus upon the sound of a name rather than the thing named, inaugurated the distant possibility of a phonetic script
Abram identifies the rebus as the decisive structural pivot between pictographic and phonetic writing, wherein the sign detaches from its referent and attaches to a vocal sound, making alphabetic writing conceivable.
, The Spell of the Sensuous: Perception and Language in a More-Than-Human World, 1996thesis