One still, a seamless loop

Muse paints one 16:9 still in a soft claymation look: a small floating clay island in a peach sky with a cream windmill, a teal waterfall pouring off its edge, mint-green trees and two puffy clouds. That one still is wired into the Image→Video node twice, on its image port (first frame) and on its endframe port (last frame), and MiniMax H3 Max Turbo (768p, 5 s) animates between them. Because the clip has to finish on the picture it began with, it plays back as a loop: the windmill's sails turn, the island rocks a few degrees side to side and bobs, the waterfall sways with it, and the clouds stay put. Measured on every frame, the last frame differs from the first by 1.2/255 on average, about the same as a normal step between two frames (0.9 on average, up to 2.4), and the most the picture ever moves away from the first frame is 7.4/255 around frame 85. The preview below is set to loop. Flaws: the model eases the motion down into the last frames and back up out of the first, so the step across the seam is about four times the tiny steps around it. On close watching there is a faint tick at the loop point, mostly in the sails and the island; at normal viewing it reads as continuous. The motion is gentle, more of a living picture than an action loop. The clip carries a quiet sound track from the model that isn't made to loop, so mute it for the cleanest loop. Swap the Image node for a 📷 Image input to loop your own picture. Every still and sampled video frame was checked and is SFW (clay scenery only; no people, animals, text or logos). Inspired by @PurzBeats sharing looping H3 videos by @_pxlpshr (https://x.com/PurzBeats/status/2113290714066944138). No media from that post is used.