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This is a demonstration of how 1/f noise is created. We begin with a noise function, depicted on the left. To this we add the same noise function with twice the frequency and half the amplitude, which results in the second picture. The third image is the sum of the noise in the second picture plus the noise function with four times the frequency and a quarter of the amplitude. We can continue adding noise of higher and higher frequency until the frequency is so high that something as large as a pixel won’t be able to record it.