Surfaces LANDSCAPES - pieces created with the perspective of standing on the surface
of a planet or satellite, looking into the sky.

Encounters ENCOUNTERS - artwork which illustrates the geometry during a spacecraft flyby of a planet or satellite.

Patches LOGOS - official mission patches created for some of NASA's flight projects to the planets.
3D pix 3D - artwork rendered in 3D (requires the red/blue glasses).
Miscellaneous MISCELLANEOUS - artwork that doesn't belong in any of the above categories.