People are less likely to drop litter if it has printed eyes on it, researchers at Newcastle University, UK, have found.
An image of watching eyes reduced the odds of littering by around two thirds.
In an experiment that could help tackle anti-social behaviour they printed two leaflets, one featuring a prominent image of watching eyes and the same leaflet with the eyes obscured. Even with no mention of littering, the simple image of the eyes deterred people from dropping the litter.