The Hubble telescope required the most perfect mirror ever created. Work on it had to be done at night because the vibrations caused by cars driving 4 miles away affected the ability to test the mirror.
There is a town in the Alps that does not get any direct sunlight for 84 days. However the town fixed that by installing a giant mirror on the side of the mountain.
Only certain animals can recognize themselves in a mirror: Humans, apes, dolphins, orcas, elephants, and European magpies.