Bill Pragnell wrote:

> This is very interesting because it shows just how good Escher's sense of
> geometric realism was. If you look at the distorted tree shapes reflected
> from the rippled areas and compare to Escher's drawings, the match is
> incredible. Sometimes  I think the man was a walking raytracer - the only
> raytracer ever to output directly to woodcut & lithograph!

Well I really wouldn't have wanted to do it by hand. But, actually,
if you look closely, you will see that in the original the waviness
of all branches is about equal, while in the render, the amplitudes
differs in some places. I *think* this is caused by the differing
distances due to the depth of the tree, which might mean that
Escher did not really design the tree itself in 3D ... but his
manually drawn tree gives the image a much nicer composition
than the n-th random branches I finally decided to go with ;)

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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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