The secret message offers children a number to call if they're being abused or neglected.
This innovative ad comes by way of ANAR, a Spanish children's aid organization. Any passerby taller than 4'15" would only see the solemn face of a young boy and this message: "Sometimes, child abuse is only visible to the child suffering it." From a child's point-of-view, however, the ad is transformed: the little boy's face is bruised and a phone number is printed alongside it, with this message: "If somebody hurts you, phone us and we’ll help you." (via Gizmodo)