The extraordinarily dull word "conlang" is the 'hip' or shortened form of "constructed language." And I'd say the "con" in "conlang" is entirely accidental. Of constructed languages the categories include secret communication and other modes of deviousness such as happy faces, 'have a nice day,' 'enjoy' and on into the plethora.. But also, constructed languages have been arranged around the idea that a language is a basis around which to think. This means, for adherents of constructed language, that through a constructed language, better thinking, or more creative thinking, or more ecologically sound thinking, can be achieved. Such minds conceive of a world in which words in sentences can be constructed in such a way as to advance the better part of us at the expense of those characteristics in us deemed "really very unattractive." However it often seems to me that constructed languages are prone to an error because the endeavor is essentially to see words as elements in an equation. Or to put it another way, noble adherents to constructed languages try to conceive of a world where a "therefore" or a "thus" should mean "=." Which in my view is a bad misreading of the always suspicious adage that "man is the measure of all things." And the equally insane assumption that language is just another form of algebra.