Abuse awareness poster is 'only fully visible to children' Published duration 6 May 2013

image caption From the view of the average 10-year-old, more information is displayed on the poster

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.

Seeking help

The foundation worried that if a poster containing a phone number that both adult and child could see, the adult may possibly say things to dissuade the child from considering seeking help.

image caption Lenticular printing can also be used to produce a 3D effect

The "secret" message on the campaign poster reads (translated from Spanish): "If somebody hurts you, phone us and we'll help you."

Lenticular printing is a concept which has existed for several decades - and has been used for various purposes, perhaps most memorably as "animated" stickers found on children's lunchboxes, stationery and other items.