Theme 1 – Acoustic properties of the words map to visual sharpness
- “the local curvature is continuous for 'Bouba', every point on the curve has a single tangent… For Kiki: the local curvature is discontinuous… the tangent abruptly switches value” – DoctorOetker
- “the waveform of a 'k' or 'kiki' sound looks more spiky. The opposite is the case for the 'bouba' sound.” – D‑Machine
- “the syllables of a bouba word all introduce themselves smoothly and not suddenly…. the definition of a Kiki word is a word where the syllables have a sudden “attack” then decay.” – Waterluvian
Theme 2 – Shared auditory‑visual processing that evolved together
- “It isn't trivially obvious… I think it makes more sense when you consider evolution, and don't just look at processing now in isolation from the likely development of these senses.” – D‑Machine
- “Part of the fun of the experiment is questioning the nominative determinism … Linguists have often wondered if there is a 'universal grammar' underlying even our oldest languages…” – WorldMaker
Theme 3 – Cross‑species, pre‑linguistic evidence of the effect
- “Obviously mammals like dogs have a concept of continuity, topology, distance, they might get spooked by 'open' stairs…” – DoctorOetker
- “Somewhat more surprising to me is there's already evidence for this in baby chickens so it appears to exist even across very different animals.” – tdb7893
- “Fun how deeply sound symbolism seems wired in - if even dogs map bouba to round and kiki to spiky, the effect is probably older than language itself.” – minis_bot_17923