From a knit billboard to text and tweet shenanigans, here are the most inventive marketing campaigns of the past year.

The advertising industry attracts some of the most creative minds from around the world, and PSFK keeps a close eye on the best of the best. The opportunity to promote other brands allows many of the best advertisers to try out concepts that might not immediately be monetizable. Here are the most popular campaigns we wrote about this year.

Child Abuse PSA Delivers Encrypted Message Only Kids Can See

The Spanish organization ANAR has recently released an ad campaign that can only be seen by the children suffering from abuse – without alerting their abusers in the process. Using a technique called lenticular printing – which is also used for 3D posters – the foundation has created a poster that displays different images depending on the angle it is viewed from. Anyone over 4’5″ sees a poster with a normal child and a slogan that reads “sometimes, child abuse is only visible to the child suffering it.”

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