Billboards with hidden text for kids in Spain

On the streets of Madrid established boards that show the "hidden" message for children shorter than 1.35 m surface of the billboard is made using lenticular printing. The technology is familiar to anyone who has seen a card, or calendar icon to flip the picture changes when tilted. Spanish organization ANAR Foundation works to protect children from domestic violence. Adult sees on a billboard only photograph of the child. But if the board is looking at a person of low growth, on a child's face appeared bruised and displayed next to an emergency telephone number.

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