the eyes can do it. create compassion. make one behave more morally

Kahneman: You just have to make sure that the right picture is hanging above the cash box. If a pair of eyes is looking back at them from the wall, people will contribute twice as much as they do when the picture shows flowers. People who feel observed behave more morally.

http://www.spiegel.de/international/zeitgeist/interview-with-daniel-kahneman-on-the-pitfalls-of-intuition-and-memory-a-834407.html