An inchworm advances through one visible body arch

1. Task and boundary

Plan one arch-and-extend movement for an inchworm already shown lengthwise on a branch. Track its two end contact regions against fixed bark marks. The requested advance must come through the changing body arch, not through a rigid whole-body slide.

The task depends on alternating visible end contacts and a temporary arch. It differs from a fish changing swimming direction and from a rope pulse whose ends remain anchored throughout.

Use an identified inchworm in a clear extended pose. Exclude handling, accelerated growth, metamorphosis and distance or speed claims.

2. Authorized first frame

Supply an authorized side image of an inchworm extended on a branch, with both end contact regions and two stable bark features visible. Avoid an image whose underside is completely hidden.

3. Use the generator

Open the image-to-video generator, add your authorized first frame and paste the prompt. Check current options and cost before you submit; this page does not upload or submit on your behalf.

1. Choose a clear side image in which the front and rear contact regions can be distinguished without guessing hidden legs.
2. Name two bark marks as references and request one arch followed by one forward extension.
3. Compare end positions in the extended, arched and final extended views; mark obscured contact as not visible.

4. Prompt and timing

A continuous fixed side macro view of the original inchworm on the same branch. Begin with its body extended. The front contact region remains in place while the rear contact region moves forward, raising the connected middle into one arch. Then the rear region stays in place while the front extends forward and the arch lowers. End with the same body extended farther along the branch. Preserve the original head, tail and visible appendages. Keep the branch and bark marks fixed. No cut, rigid sliding body, added legs or broken body segments.

5. Inspect the output

Inspect the actual clip from start to finish. Use pass, fail or not visible for each check; an attractive final frame does not prove the intervening motion.

• The front end stays at its first bark reference while the rear end approaches and the middle arches.
• After the rear end settles, the front end advances and the same arch becomes lower.
• The head and tail remain connected by one continuous body throughout both phases.
• Both end contact regions finish farther along the same branch without a change of scale.

6. Fix one failure

• If the entire animal slides unchanged, separate the rear-advance and front-extension phases in the prompt.
• If the body breaks at the arch, reduce its height and preserve a continuous underside.
• If new legs appear, retain only the appendages visible in the source rather than specifying a new count.

7. Ending and limits

End after one cycle with the original inchworm elongated again and both ends farther forward on the branch.

This is an untested motion design for the supplied subject, not a measurement or a species-wide claim about locomotion. Do not apply it to an arbitrary caterpillar whose visible form does not support the requested movement.

After inspecting a result, use the available result-save or download control. Keep the first frame, exact prompt and complete output together so that revisions can be compared.

This is an original prompt design with visual acceptance criteria, not a generated demonstration or a tested model-performance claim.

• Follow one aquarium fish through a turn