Sign Languages
Sign Languages Are Not Mime: What Your Hands Actually Know
Sign languages have grammar, poetry, dialects, and puns — they are complete human languages, and the fact that you can't hear them tells you nothing meaningful about their complexity.
The Idea
Most people, when they first encounter a sign language, assume they are watching a visual code for spoken words — a kind of elaborate gesture system that translates English, or French, or Japanese into hand shapes. This is almost entirely wrong. Sign languages are not derived from spoken languages. They arise independently, spontaneously, wherever deaf communities form, and they develop their own grammar, syntax, and idiom entirely on their own terms. American Sign Language (ASL) and British Sign Language (BSL) are mutually unintelligible, despite the shared spoken language of their surrounding cultures — which tells you something important about where sign languages actually come from. They emerge from community, not from translation. Linguists have established that sign languages process in the same regions of the brain as spoken languages, follow comparable patterns of acquisition in children, and can even be babbled — deaf infants with signing parents produce rhythmic, repetitive hand movements that mirror the babbling of hearing infants. What sign languages do differently is exploit a different channel: space. A signer can show that one person gave something to another by moving a sign from one point in space to another. They can indicate time by positioning events along an invisible timeline running through the body. They can make a verb agree with its subject and object simultaneously — a kind of grammatical layering that spoken languages achieve only sequentially. The medium is different. The cognitive depth is not.
In the World
In the 1970s and 1980s, something remarkable happened in Nicaragua. The Somoza dictatorship had kept deaf people largely isolated — there was no deaf community, no shared language, no school that taught signing. When the Sandinista government opened special education schools and brought deaf children together for the first time, the teachers tried to teach them to lip-read Spanish. The children largely ignored the lessons and, on the buses and in the playgrounds, began to develop something else entirely: a shared gestural system that rapidly, across just two generations of children, became a fully grammaticalised language. Linguists including Judy Kegl, who documented the process, describe it as one of the only times in recorded history that humans have witnessed a language being born. The older children who developed the initial contact system — basic, improvisational — created something functional. The younger children who learned from them took it further, introducing the grammatical complexity that marks a mature language: consistent spatial grammar, a distinct verb class, the works. Nicaraguan Sign Language, now called Idioma de Señas de Nicaragua, did not come from Spanish. It came from children with language faculty and no language — and that faculty insisted on building one. The lesson is stark: language, in humans, is less a cultural acquisition than a biological pressure. Given community, it will emerge.
Why It Matters
Knowing this changes the way you hear — or see — the debates around deaf education, cochlear implants, and deaf culture. For much of the twentieth century, a method called oralism dominated: deaf children were taught to speak and lip-read, and signing was actively suppressed, sometimes literally by tying children's hands. The logic was that signing would prevent integration into the hearing world. What that logic missed, and what the Nicaraguan case makes viscerally clear, is that signed languages are not a consolation prize or a workaround — they are language, full stop, carrying the full weight of human thought, humour, and poetry. The debate over whether to give a deaf child a cochlear implant remains genuinely complex, touching on medical ethics, identity, and community. But that debate looks different once you understand that signing is not a lesser mode of communication that implants would mercifully replace. It is a language with literature, slang, and an in-group joke your hands might one day learn to tell.
A Question to Ponder
If language can arise spontaneously in a generation from nothing — as it did in Nicaragua — what does that suggest about how much of what you think of as 'your' language actually belongs to you, and how much arrived unbidden, before you could choose?
Get a new one of these every morning.
Start learning with Thinkable