It's the screensaver you hated to interrupt. It's pipes and nothing but.
1.56 added screen saver Dream support
1.55 added ball joints
1.51 SDK update and race condition bug fix
1.5 added structures: shallow, circular, twisted
1.4 route options, added styles: black striped, haunted hamster, and random
1.3 added styles: extra glossy, flat glow, candy cane, hollow helix
1.2 more color varieties, capped ends, fade-out transition, lighting styles, wonky structure and tangled structure
1.0 initial release