Crayola: Swirls - Nature's Designs
Crayola

What happens when you combine an art technique called sgraffito with the beauty of spiral designs in nature?

youcubed: What Would the Nautilus Say? (6-CC)
youcubed (Stanford University)

While the nautilus shell is often represented in popular culture as an example of a golden spiral, according to many mathematicians it is not.

NRICH: Fibonacci Surprises
NRICH (University of Cambridge)

Play around with the Fibonacci sequence and discover some surprising results!

Illuminations: Golden Ratio
National Council of Teachers of Mathematics

Using the rule that defines the Fibonacci sequence, can you determine the value of the Golden Ratio?