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Take a close look at a sunflower head. Have you noticed that the seeds are arranged in a spiral pattern. Notice, too, that they are REALLY tightly packed! Plants grow new bits from a central point called the meristem. Every new growth comes out of the centre at an angle with the previous growth. However, only with a VERY specific angle can the plant make the most economical use of the space. This angle is called the Golden Angle and is approximately 137.5 degrees. If they didn't grow at this angle, the plant would form its growths (seeds, petals, etc) in rows rather than spirals and you would end up with gaps. Amazing stuff!