Have a look at the video at the following site: http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/index.html. Is there any design-theoretic significance that on a logarithmic size-scale, we’re close to the middle of the known physical universe? Regardless of the answer to this question or whether there even is an answer, you’re in for a treat if you haven’t seen such a “power of ten” video in the past.