Smiling, happy Lego characters are becoming less and less common, researchers have identified. Experts at the University of Canterbury in New Zealand and the Industrial Research Institute for Automation and Measurements in Poland studied over 3,655 figures and found that the number of happy faces on Lego characters has fallen since the 1990s, giving rise to more angry and fearsome expressions. It is believed that Lego's introduction of conflict-based themes has encouraged the change, with new sets often depicting battles between good and evil. In its report, The Guardian looks into whether angrier faces are negatively affecting young children and explains why Lego believes it is good for kids to play out conflicts with their toys.