Only for Children: [via: DIY Photography]" The ANAR Foundation is a Spanish organization which helps kids in risk. They Operate a unique phone number - 116 111 - where minors at risk can get aid and consultation.
Anar did a campaign advertizing the number, but were facing a problem where they did not want potential aggressors to see that a kid was even looking at the ad.
The solution was using Lenticular printing [wiki] on street signs." "Anar created a poster that conveys a secret message to people at different heights, even if accompanied by a potential aggressor.