If I recall correctly, the sky was golden in the Fire Age. I believe it's blue because the Waters invaded Heaven during the Gods' War.
>From glorantha.com:
From one end of the sky to the other, the Celestial River arches overhead. This undulating swatch of light has the greatest concentration of stars and constellations. In the Gods War the Celestial River flooded the Sky Dome so it is blue now, and not gold as it was during the Golden Age. However, Polaris, Ourania and Dayzatar released their divine powers and would have destroyed the river, except that it transformed to be able to exist in the Sky World. Thus this water is now fiery, as the God Learners demonstrated when they summoned it to destroy the Waertagi during the Imperial Age.
http://www.glorantha.com/products/samples/otherworld.html
Which means, of course, that water is naturally blue. In *our* world, the ocean is blue because it reflects the sky--but in Glorantha, it's closer to the other way around.
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