Mike Williams wrote:

> Escher erroneously drew the moon's reflection as distinctly oval.
> 
> http://www.maths.qmul.ac.uk/~ade/sldimages/escher.ripple.gif

I'm not sure what to make of that image without context, but the
source for my image features a round moon and looks like this:

http://www.artistsmarket.com/escher_masterworks/ripsur

Actually, I used a postcard purchased last week in the Escher
museum in Den Haag, where I got the idea for this render ;)

But it's funny you should mention this, because my first moon
was also annoyingly elliptical due to perspective distortion,
so I ended up using a setup with camera angle 25.

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