Retinal cells are arranged in a blue-noise pattern, which a number of studies have shown yields good visual resolution. Violet noise is, similarly, like an inverted version of brownian noise.

While green noise has long been my favorite, I may have discovered a new contender while writing this article: blue noise.

White noise is familiar to most people, but it's not the only color of noise that exists. Blue noise, which is sometimes considered high-frequency white noise, has a spectral density (power per ...

But there are different varieties of noise—patterns within that randomness. When a cat makes that “sss” sound, zillions of air molecules create sound across a broad range of frequencies.