There are lots of practical uses. One that immediately comes to mind is cache-friendly layout of power-of-two textures, usually called texture swizzling. Anothe

There are lots of practical uses. One that immediately comes to mind is cache-friendly layout of power-of-two textures, usually called texture swizzling. Another application is designing clock trees on VLSI chips to minimize clock skew; that's actually a space-filling tree rather than a curve, but it's closely related.