## C15 · Two picture gates, one material question

**Complete source:** Original fiction. A paper piece and clean cloth piece have matched broad outlines, flat starting state, same mat, edge, viewpoint and adult operator. The question concerns their resting bends after the same intended gentle edge lift to the same stated height. Paper rests with a higher bend; cloth rests with a low bend. Exact hand force is unmeasured and each has one attempt. These are fictional game-picture gates, not real structures to support weight.

**Own invitation:** What was deliberately changed? Name one useful match and one limit.

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<summary>Worked possibility and a different next teaching invitation</summary>

**Source-supported possibility:** Material is the intended difference for this resting-shape question. Outline, start, mat, edge/view/operator and intended lift are relevant matches; one attempt and unmeasured force limit generalisation. It is not automatically invalid because material differs, nor a proof about every paper or cloth.

**Unknown/limits:** Keep every missing force, path, future attempt, actual child operation and player response within this source’s stated limits. A complete fictional record is source evidence, not performed-investigation evidence.

**Full next teaching:** Use C08’s different strength-comparison question with changed starts/operators. Invite a match that serves that question; observe whether the child names the intended comparison rather than demanding identical everything.

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