It's 5.8.13 or Fibonacci Day in America

©. Le Corbusier

In 1202, Leonardo of Pisa, also known as Fibonacci, introduced westerners to the concept of the sequence where each subsequent number is the sum of the previous two. (It came from India). Le Corbusier used the sequence in his development of the Modulor; according to Wikipedia,

Le Corbusier's faith in the mathematical order of the universe was closely bound to the golden ratio and the Fibonacci series, which he described as "rhythms apparent to the eye and clear in their relations with one another. And these rhythms are at the very root of human activities. They resound in man by an organic inevitability, the same fine inevitability which causes the tracing out of the Golden Section by children, old men, savages and the learned.

How Fibonacci Numbers are Expressed in Nature (Video)

Stephen Messenger emoted earlier about Fibonacci:

To gaze upon the masterful beauty of a pristine forest at dawn or the delicately intricate wings of a butterfly, one might surmise that Nature, at heart, is an artist. Though as most people already know, there exists in the natural world a detailed sense of numerical order that bears the mark of a true mathematician, yet often it seems you have to be one too to fully appreciate its complexity. Maybe you recall some sleepy high school algebra class discussion of the Fibonacci sequence, a handy mathematical formula used for making boring old golden spirals -- but perhaps you've never fully appreciated the significance of this sequence to life on Earth.

13-Year-Old Makes A Solar Breakthrough With Fibonacci Sequence

solar pioneer kid aidan dwyer fibonacci photo
One would be excused for suspecting that Aidan Dwyer, said to be 13, is in fact a small, very young-looking, 37-year-old college-educated con-man of the highest order. Such is not the case though for what the young Long Island lad has accomplished in a feat typically associated with much older individuals. As reported on the Patch community website out of Northport, N.Y., Aidan has used the Fibonacci sequence to devise a more efficient way to collect solar energy, earning himself a provisional U.S. patent and interest from "entities" apparently eager to explore commercializing his innovation.

Richard Heinberg's Tiny Fibonacci Studio

heinberg tiny house photo

Fair Companies/Video screen capture

From his views on the end of economic growth to his post-carbon memo to Occupy Wall Street, Richard Heinberg is known as an accomplished researcher, wordsmith and activist who has done more than most to raise awareness about resource depletion and the limits of our current economic paradigm. But who knew that he also dabbles in green building?

David Bergman Fibonacci Lights

fibonacci light

David Bergman/Promo image

From the very early days of TreeHugger when the pictures were small and the titles were short, a spiral lamp by the green architect/designer David Bergman, AKA the EcoOptimist.

The United States records dates in a month/day/year format; most of the world uses a day/month/year format so they will celebrate it in August 5, 2013, also 5.8.13, and Americans get one more crack at it in 8 years on 8.13.21.