Fibonacci spiral patterns ~ The Atlanta Botanical Garden has one of the few specimens of this rare South American cactus. Apparently this variety only flourishes in the high altitude, remote (and windy) Andes Mountains.
Lania by Anne Fugat - Beautiful! looks like a "nautilus" seashell-the one which grows in a spiral, which has the "Golden Ratio" observable in many places and things in nature. (hint: read up on Pythagorean theorem, chaos theory, repeating digits, etc.