| ▲ | keyle 3 hours ago | |
TL;DR it helps you identify the true diameter of your visual focus, which is said to shrink with old age (mine shrinks more in terms of _time_ dimension but that's a different issue!) For best results, use it _fullscreen_, change the #define `90` values to a higher value if you're on a high dpi screen. Stare at a few places on the screen and you'll get the effect of appearing to rotate only where you stare. It's pretty neat. | ||