The Perlin noise is generating a scalar field in this case (which gives the direction of the movement vector at each point). Here's a very similar bit of code t

The Perlin noise is generating a scalar field in this case (which gives the direction of the movement vector at each point). Here's a very similar bit of code that can be tweaked easily: https://openprocessing.org/sketch/494102/ https://openprocessing.org/sketch/494102/ Setting the particle speed to more than about 0.5 (on line 46) results in "aberrations". The dynamics are quite interesting and I'm not sure exactly what's going on, but I think wetmore's answer is correct—when the steps are small enough, everything remains as smooth as the underlying scalar field produced by Perlin noise.