Orbits of Mercury, Venus, Mars & Jupiter (not to scale).
Computed with PyEphem as they would appear from Earth – north ecliptic pole.
Gelly rolls on rugged black paper with axidraw.

Sensawunda!

Two perpendicular thoughts: 1) I am amazed how easy it still is for a large program (like Blender or Firefox) to fail to compile on a modern, common distro. A large list of dependencies greatly increases the chances of compile-time mishaps and makes the whole process resemble surgery. 2) I am amazed at how easy …

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