Noctilucent clouds are crystals of ice hanging around 50 miles high in the atmosphere that catch the light of the sun long after it has set on the horizon.
The golden ratio. The ratio between the Fibonacci numbers is found throughout nature <-- between any numbers of a sequence where the next term is the previous two added together. The fibonnaci sequence isn't special. I much prefer the Brady sequence
In order to understand the universe....
sea urchin fractal
Sternenstaub : Foto