In a square window,
sphere {
    <0, 1, 2>, 2
    texture {
        pigment { color Yellow }
    }
}
produces an ellipsoid, the vertical radius is larger than the horizontal radius:
`povray -Idemo.pov +V +W400 +H400`

Apparently, the window proportion must be 1:1.33 in order to produce a sphere
with a fixed radius. Should not sphere appear circular no matter what the window
proportions in the render command?

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