Volapük

There's a wide variety of reasons people do this.

Sometimes it's to facilitate communication, like with Esperanto or Volapük.

Sometimes it's for artistic purposes, stuff like Klingon and Tolkien's languages Quenya and Sindarin.

And sometimes it's just to try to mold language into some kind of interesting shape, like Lojban or Iskuil.

Nowadays, we would call this like an englang.

This is what I was talking about earlier is like trying to make something out of language, either perfect it or do something interesting with it on like a mechanical level, right? Then, like, 19th century is when we get what we now call the auxlangs, the auxiliary languages.

Volapük, which was aiming to be like an interlanguage, like a lingua franca that's artificially constructed.

And then Esperanto, which is the more well-known one by L.L. Zamenhof.