A poster than can only be fully seen when looked at from a child's point of view has been used in an anti-child abuse campaign.
Spanish organisation the Anar Foundation used lenticular printing - a technique which means those looking at different angles see a different image.
On the poster, a "secret" message showing a child helpline would show up when seen from a child's height.
The foundation said it helped children gain confidence to call the number.
The campaign was designed get the information about where to find help to children who may be accompanied by their abuser.
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