让一个瞬间，无限循环

Create a calm 4-second looping animation of [a simple subject] in a minimal illustrated scene. Choose exactly one repeating motion: [swaying / rotating / floating]. Lock the camera and keep the background and lighting constant. Use an even motion cycle so the subject returns to its starting position and velocity at the end. Muted teal, blue, and pale pink palette, clean shapes, soft shadows. No scene cuts, camera movement, text, or additional moving objects. Compose for a seamless loop; review the first and last frames.