The Fibonacci sequence builds each number by adding the two before it — a simple rule that turns out to be everywhere in nature. When you count petals on flowers or trace spirals in sunflowers, pinecones, and pineapples, those counts often land on Fibonacci numbers. Successive leaves on flowering kale grow at about 137 to 140 degrees apart, an arrangement linked to ratios within the sequence. That angle is called the Golden Angle.