[nate00]

I'm not sure what to make of the sentence at the top of the ad.

Sometimes, child abuse is only visible to the child suffering it.

It seems like the sentence is supposed to be a clever wink, which makes me wonder whether the lenticular photo effect is meant for secret communication or for a discussion-provoking gimmick.

[bostonpete]

It told me that the sign was more intended to promote awareness of child abuse issues than to really serve as a secret/hidden message to abused children.