Chapter 4 The philosophy of sound, meaning, and grammar
Sound as symbol
There is an old human intuition that sound and meaning are connected by more than convention. English speakers may feel it in "smooth," whose consonants slide, or "sharp," which stops more abruptly. Children playing with language reach for sounds that seem to fit what they mean. The fit can feel immediate, but it is not always shared.
Phi leaves room for that intuition without making a law of it. A sound may help a word settle into memory, and a family resemblance may make related words easier to hear. Neither effect gives a phoneme one universal meaning. Languages, communities, and individual ears make different associations.
The mouth before the metaphor
The body gives Phi a firmer place to begin. Air narrows or stops. The lips meet, the tongue touches the teeth or the roof of the mouth, and each vowel changes the shape of the passage. Stress gives one syllable more weight. Hiatus asks adjacent vowels to remain two distinct syllables.
These are observable facts about saying a word. An entry's articulatory_notes follows the complete form through the mouth so a speaker can reproduce it. The note may still have rhythm and warmth, but it does not need to make the tongue's every movement stand for an idea.
Symbolism when it earns its place
Sound symbolism begins after that physical account, and only when there is something honest to hear. A speaker might hear the trill at the opening of remo (think) as thought in motion. That image can be a useful mnemonic without becoming the meaning of r. Another speaker may remember the word differently and lose nothing.
Deliberate lexical kinship is more concrete. sileta (sun) and silero (star) share their opening because the sun is a star. The resemblance belongs to those words; sile is not a reusable root hidden inside every form that happens to contain it.
The optional sound_symbolism field records associations of this kind. Omitting it is more accurate than inventing a story after the word already exists. Phi listens for sound and meaning together, but it does not require them to pretend they have always agreed.