conlangs1-7  Exercise 1: Natural or Constructed?
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  (a) British Sign Language
        Natural. A full language. It grew in a Deaf community and has its own
        grammar.
  (b) Gestuno as published in 1975
        Constructed. A list of about 1,500 signs compiled by a commission,
        with little grammar. Not yet a full language.
  (c) Silbo Gomero
        Natural. A medium shift: Spanish carried by whistling.
  (d) Solresol
        Constructed. A designed vocabulary of seven notes, intended as a full
        language but never with fluent speakers.
  (e) International Sign as used today
        It grew out of Gestuno through use by signers and interpreters, who
        added grammar from natural sign languages. It is best described as a
        contact or pidgin-like system that developed from a constructed list.

The point: "constructed" is about origin, "full language" is about structure
and use, and the two come apart.