Lhahu is a logically/mathematically-based language with a ridiculous number of very fine cases, most of which i've made up. Specifically, 35 of them, consisting of many of the old standards like accusative, instructive, causal, dative, and allative, as well as some of the lesser-known forms like revertive, exclusive, benefactive, conciliative, durative, and egressive, but not to be outdone by some i just plain pulled out of my butt, such as ablato-prolative, quanto-partitive, ablato-dedative, abesso-caritive, and locato-pertingent. It's based on this, and that's about all i can say about it at the moment:  yellow = up = air = noon = new moon = u = unvoiced
orange = south = fire = waning moon = summer = o = unvoiced green = east = yeast = morning = spring = ɔ = unvoiced grey = center = neutral = a red = west = poison = evening = autumn = ɛ = voiced blue = north = water = waxing moon = winter = e = voiced purple = down = earth = midnight = full moon = i = voiced It's also based on sets of consonants: labial, dental, and velar, most of which don't actually fall into those categories:
There is also another category of strident consonants, which is more complicated, given a larger number of letters:
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