To promote a children's speech therapist consultant with a limited budget. On the playgrounds in the area of the speech therapist office, they left hundreds of "lost letters". Each letter had a sign "We'll help your child to find all the lost letters" and the docter's phone number on it. When children found these letters they brought them to their parents together with their message. The number of the docter's visitors increased by 15%. Some of them came with the found letters, wich were put back on the playgrounds.
Agency: Adventa Lowe Kiev, Ukraine.