How many languages do you actually speak?

The widest channel. Photons travel at light speed, do not diffuse, and can be reflected, focused, archived. Almost every long-lived language we know has a visual instantiation.

Vision is the bandwidth king. The optic nerve pushes roughly one megabyte per second into the cortex; the rest of the senses combined are an order of magnitude less.

Crucially, photons are particles of pure information. They don't drift, they don't decay over the timescales of human action, and they can be turned into pigment, ink, etched glass or arrayed pixels. A sentence written today can still be read in a thousand years.

This is why every civilisation eventually invents writing, why most signaling systems converge on visual form (flags, icons, road signs, fonts), and why the screen has become the dominant interface between humans and machines.

Time-shaped. Sound is intrinsically sequential, which is why our deepest grammars — spoken language, music, code — first emerged here.

Where vision is spatial, hearing is temporal. A sound exists only across time; there is no static image of it. This is why grammar — sequence, rhythm, tense — was invented in the ear before it was invented in the eye.

Hearing's bandwidth is about a hundredth of vision's, but its information density per bit is extraordinary: micro-pauses, pitch, timbre and stress all carry meaning in parallel. A spoken sentence is closer to a chord than to a string of letters.

Music is the purest auditory language. It has no obligation to denote anything in the world — its grammar is its meaning — and that is why it crosses cultures faster than speech.

Zero-range, highest privacy. A touch language reaches exactly one person. Braille is the only complete writing system we have here — but it could host much more.

Touch is the channel of intimacy and privacy. To say something in Braille, you must hand the page to exactly the person you mean to reach.

It is also under-colonized by language. Beyond Braille, we have almost no formal tactile grammars — and yet haptic devices, prosthetics and AR gloves are about to flood this channel with new information. What does a touch-native programming language look like?

The dolphin's clicks, the bee's waggle, the lover's squeeze — most of life's tactile signaling sits in the protolinguistic layer below symbolic grammar. There is enormous unclaimed territory here.

No native language has ever taken root here. The reason is physical: taste rides on Brownian molecules, and Brownian molecules cannot be archived.

Taste is a five-channel signal: sweet, sour, salty, bitter, umami. Five symbols is not much grammar.

More importantly, the substrate refuses to hold still. Taste rides on molecules dissolved in saliva — molecules that diffuse, react and bind. There is no taste equivalent of the printing press, because the moment a flavour exists it begins to vanish.

Cuisine is the closest thing we have to a taste language, and it is encoded indirectly — in recipes (visual), in technique (kinesthetic), in tradition (oral). The taste itself is the performance, never the score.

The only channel where another kingdom of life — mammals, insects — runs richer protocols than we do. Animal scent-marking is a primitive but real grammar.

Of the seven channels, smell is where humans are linguistically poorest and other species are linguistically richest. A dog's nose runs vocabularies of identity, mood, sex, threat, age and trail that no human language can replicate.

The reason humans never built a scent-language mirrors taste: airborne molecules diffuse, oxidise and dilute. You cannot transcribe a smell into a stable medium. Perfume notation is the closest analogue, and it is parasitic on writing.

Future synthetic biology may close this gap. Programmable scent emitters, paired with high-resolution olfactory sensors, could give humans their first true smell-grammar — a channel of communication our species has never had.

The oldest channel. Body language predates speech by millions of years. Sign languages and dance are its formal grammars.

Before there were words, there was posture. Body language is the channel we share with every primate, every mammal, every fish. It encodes status, intent, fear, invitation and threat with breath-tight precision.

Sign languages are full natural languages — recursive grammar, phonology, morphology — that happen to use hands and face instead of larynx and lips. They invalidate the notion that 'real' language requires sound.

Dance is the most concentrated kinesthetic grammar we have. It treats the body as a sentence: rhythm is its verb, tension its noun, release its punctuation.

Not a sense at all — a layer above the senses. The conscious bottleneck is narrow, but what passes through it lasts longest.

Strictly, the cortex isn't a sense; it's the layer that processes the others. But it has become its own communication channel — the channel of pure symbol.

Mathematics, formal logic, programming languages: these are tongues that the cortex speaks to other cortices, often without ever passing through eyes or ears in their raw form. A theorem proved in Beijing is the same theorem proved in Berlin.

Conscious bandwidth is famously narrow — about 40 bits per second, ten thousand times less than the optic nerve — but symbols compress further than any other channel. The Pythagorean theorem is a few bytes; the consequences are infinite.