The Beziers screen saver.
Beziers is a screen saver included with some versions of Microsoft Windows. It was first introduced in Windows 3.1 and comes with every subsequent version of Microsoft Windows up to Windows XP. The screen saver's file name is "ssbezier.scr".
Description[]
This screen saver depicts a red, looping string that moves across a black screen in various directions. Each of its points and beziers (curves) moves in its own direction. The string leaves a trail of additional strings, which begin to disappear after enough trails have been created.
Settings[]
The number of beziers in the loop can be set, from 1 to 10. The default value is 4.
The maximum number of strings that trail behind the loop can be set, from 1 (which just shows the loop itself with no trail) to 100. The default value is 30.
The speed at which the loop moves in can be set through a scrolling bar, ranging from slow to fast. The default setting is in the center.