Digital billboards are making it possible to connect with people in ways we couldn’t imagine a few years ago. To mark International Women’s Day last weekend, UK-based Women’s Aid worked with WCRS London to launch a billboard campaign to raise awareness of domestic violence. The billboard features an obviously battered woman with two black eye, swelling and cuts on her face. From time to time, she blinks sadly.

Using facial recognition technology, the billboard lets passersby heal the woman’s wounds by looking at her. The more people stop and look directly at the image, the faster her face heals and returns to normal. The facial recognition technology can register exactly how many people are looking at the poster and pick out their faces from the crowd and display them through a live-feed of the street.