Entry 12 · the alphabet of motion
A motion whose end frame matches its start frame — perpetual without seam.
CSS @keyframes · loop
The long entry
Loops are the workhorses of ambient motion: spinners, marquees, breathing buttons, animated logos. The art of looping is the seamless join — the last frame must hand off to the first without a perceivable discontinuity. Often achieved by easing into and out of the same pose.