One day I had a desire to see a magnified perspective of a 3D-printed object, and I was lucky enough to have the tools available in my lab to make this happen. The result is shown in the image, which to me looks like a blue planet. In reality, it is an approximately 200 times magnified image of part of the 3d printed object shown in the inset (top right). The 3D-printed object is two discs intersected perpendicularly. When rolled, its centre of mass remains constant. To learn more about this object and associated mathematics, visit the educational YouTube channel, Numberphile. They call this object wobbly circles. It can also be 3d printed from Shapeways. I have no affiliation with Numberphile or Shapeways.