Making Art with the Golden Ratio. At the website, the golden rectangle spiral is overlaid.
Since I'm a math major! Making Art with the Golden Ratio - nice! And it's entitled "math craft" !
Nature's First Pattern naturally divides into twelve equal parts . These 12 equal parts are 30 degrees each and are the basis of the ancient 12 House Astrological System.
Cactus - Sacred geometry in nature
Pink grapefruit oil Painting by Dennis Wojtkiewicz. Makes me dream of this as a stained glass window.