Here is one of the most awesome electron micrographs — order in life — i have seen. It is truly fantastic, a testament both to human desire to know the universe, and the amazing “plan and order” that the universe is (of course along with the amazing but not so happy entropy) both fearful and wonderful. It is hard to imaging a nano processing machine that could arrange little gears and tubes with any more precision than seen in this person’s figure. I couldn’t get a link to the original article, but here is info if you want to pursue it on your own. Too amazing.
FIGURE 4. Negative stain electron microscopy images of the HsiB1C1 complex shows tubular and cogwheel structures. A , micrograph of negatively stained HsiB1C1 complexes showing both tubular and cogwheel-like structures. The scale bar corresponds to 100 nm. B , examples of raw images of cogwheels exhibiting both 13- and 12-mer arrangements with a central hole of ϳ 100 Å. C , examples of tubules that show a four-layered striation with discontinuous staining. D , oblique view of a short tubule structure that clearly shows the central channel. The scale bar corresponds to 10 nm (applies also to B and C ). I think this ref is  Lossi et al., 2013.