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I wouldn't want windows on any vertical curve because you don't want to have to rely entirely on the seals to keep water out, and can't easily incorporate a proper eave that rejects summer sunlight, but accepts winter.
That's partly why I'm more inclined to a silo house than a dome. Getting glass curved just so would be a pita, and the eves wouldn't be a straight forward, but at least you're dealing with a fixed vertical plane. From the photo above, it seems the problem of curved glass was probably solved by just making the windows so tiny they could be flat without posing much issue.
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