GREY SPAIN published this powerful video two weeks ago, but it has only exploded online now, quickly amassing over 4 million views.

The video explains a new advertisement standing in Spain that has a secret message that is only visible to children. The ad projects two images, one that is visible to adults, and a second that only kids standing under the average height of a ten year old can see. 

Since in many cases children know and are even watched over by their abusers, the ad warns kids, “If someone hurts you, phone us and we’ll help you,” while adults can only read, “Sometimes child abuse is only visible to the child suffering it.”