Fractal based on iterating z(n+1)=(phi^z(n)-(-phi)^n)/sqrt(5), where phi=(sqrt(5)+1)/2 is the golden ratio. This is the Binet closed form formula for Fibonacci numbers for positive integer values of z. The complex plane has been inverted w=1/z for this picture, making infinity the center point. The color denotes the number of iterations until the value becomes infinite at Matlab's numerical precision. Note the dark blue "clouds": points starting here converge towards 1 instead.