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I believe it's simply because as miners, they live in an environment devoid of sunlight, not to do with physical stitching.
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But the other non-blind mudokons that also work in the mines aren't white.
Also, I have a question. Since the Glukkons have really small legs and have to walk on their hands, why don't they just mechanically extend their legs like the sligs? It would be a lot easier for them and if the sligs deserve to use their arms and legs, why don't the glukkons?