1. Create snow sphere and make positive. 2. Duplicate and move up until the 2 spheres are just touching and make this one negative. 3. Duplicate 1st sphere and apply skin texture and make slightly smaller. 4. Group snow spheres together (positive and negative spheres). 5. Set time scrubber to half the time you want. 6. Select just negative sphere and move it down and off to the side until you get your "moon". 7. Move time scrubber to the full time you want (ie if you want a 1 sec gif the first move will be to half a second and this move would be to one second). 8. Go into animation lab, shift click on sphere and select pendulum. 9. Exit lab and set a ketframe.