conlangs1-7  Exercise 2: What Gestuno Teaches
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One possible paragraph.

Gestuno gave deaf people from different countries a shared vocabulary of
about 1,500 signs, but a vocabulary is not a language. It had almost no
grammar, so signers had no agreed way to combine the signs into sentences,
and it had no community that used it daily. It was hard to understand when
first used. The language that worked, International Sign, came from signers
and interpreters who added grammar from their own sign languages and
reshaped the signs by using them together.

The original design lacked grammar and community. The lesson for a designer:
write the grammar, not just the word list, and plan for people to use and
change the language.