Make the Discussion Friendly
If you share the puzzle, let friends know that the suggested answer is disputed by the visible seat-like boards. Ask what they can actually point to, rather than challenging them to accept a reveal they cannot see.
Someone noticing the boards has not necessarily “missed the trick.” Someone initially following the source’s explanation has not failed a test either. A discussion can change when people compare details, and changing your mind is more useful than defending a caption at all costs.
You can even make two short lists: visible features and claims about those features. Keeping them apart is a handy habit for any picture that arrives with a dramatic explanation. It lets a playful activity stay playful without rewarding overconfidence.

One Last Check Before You Share
Read your own description and ask whether it promises more certainty than the picture provides. If you write that the women have nothing beneath them, can you account for the boards visible along the front? If not, soften the claim rather than asking the reader to ignore them.