The Spanish advocacy group ANAR Foundation commissioned an outdoor ad against child abuse that uses printing technology that allows a secret message to be seen only by children, or people standing under 4’3″.
To adults, the ad features the face of a child with the message: “Sometimes child abuse is only visible to the child suffering from it,” Adweek reports.
To children, however, the face has bruises on it with the message, “If somebody hurts you, phone us and we’ll help you.” A hotline telephone number also appears.
The effect was created by using lenticular printing technology to create the overlaid images, Adweek reports. The ad was created by the agency Grey Spain.