These paperweights show two different hemispheres of the moon; one the side visible from earth; the other the hidden side. A bottom is provided which can be glued on after filling with weights. Alternately the two halves can be glued together to make a complete moon. The data comes from NASA's Lunar Reconnaissance Orbiter (LRO). The files were created using the program "globe" by DJ Moews available at:
http://djm.cc/dmoews.html. See note.