Hey, as I say in the post - I make no claims whatsoever for the visualisations. They were strictly for fun, and I'm a bit surprised to find them on HN. However... choosing colours along the Hilbert traversal of the RGB cube is good if you want a sequence of many colours that are maximally distinct, where similar colours (here "similarity" is their distance from each other in the RGB cube) are as close as possible to each other in the sequence. In fact, the Hilbert curve's properties guarantee that this sequence will be near optimal - we don't know how to do better without restricting ourselves to some subset of the RGB cube.