One image, one line: 'build the bat,' and Claude delivered a mechanical bat with foldable wings

Kitsui posted a very direct test on X: give Claude Opus 5.5 an image, type 'build the bat,' and get a mechanical bat simulator. It used the free skill shared by Elvar. The interface in the video is called Nocta VX-4; in the center is a white-and-orange mechanical bat, and the left and right sides list wingbeat frequency, glide angle, power, battery, servo load, altitude, speed, attitude, and the status of each component.

Kitsui laid out the build details clearly: the image defines the appearance, and then every panel, wing spar, and claw is generated by three.js code; Opus compared the rendered bat side by side with the original image and filled in gaps before outputting the first frame; each wing has 3 finger bones for support, and the wing membrane is rebuilt from the finger bones every frame, so if one finger folds, the membrane wrinkles with it; the first version's wingbeat was like a bee's, and later it was changed to 1.6 Hz with gliding added in between; every 2.7 seconds a component opens and closes, including the eye lens, ear glass, chest motor, feet, and arms; when the wings fold, the corresponding servo row flips to FOLDED, and when the model is exploded, each row reads DETACHED. The first time he used this free skill, the bat came out complete.

In the comments, a few details are more interesting than 'the model is good again.' HashItOut converted 1.6 Hz to 96 times per minute and said that at this speed you can clearly see the wing membrane wrinkling around the three finger bones, and asked whether this number was given later or chosen by Opus itself. The source material gives no answer. Kelvor noted that rebuilding the wing membrane from the finger bones every frame matches the structure of real bat wings: a bat wing is essentially long fingers plus membrane, and the membrane follows the fingers; bird-style rigid wings do not fold that way. Luciano also thought that the detail of rebuilding the skin every frame was the key. Vronzu asked how many rounds of fixes against the original image it took before it looked right.

These discussions point to something more practical: the appearance is defined by the image, the structure is generated by code, the rendered result must be compared with the original image, the wing membrane is rebuilt from the finger bones every frame, and the folded and detached states can be read out. Model capability is important, of course, but the skill that breaks the task into this repeatable workflow is equally key. Elvar's article includes the skill entry point; in the replies, some people saved it, some planned to install it, and some just gave it a star.

If you want to reproduce it, the entry point is in Elvar's article: https://x.com/i/article/2116115649856430080 . The original tweet is on Kitsui's account: https://x.com/0xKitsui/status/2116525446560977059 . The material shows only one successful case and cannot guarantee that it will come out right in one shot every time. Someone in the comments wrote, 'No way to stop But we need to keep pushing the Claude narrative'—a lively remark. The harder evidence in the video is that when the bat folds its wings, the wing membrane really does wrinkle around the three finger bones.