In a seminal study in motivation literature, psychologists, Lepper, Greene and Nisbett identified preschoolers who naturally enjoyed drawing during playtime and offered an incentive to continue drawing. 1 Following the understanding of human behaviour at the time, they initially hypothesised that offering incentives would heighten the children's interest. However, children who were offered incentives unexpectedly showed much less interest and spent much less time drawing. Daniel Pink, who describes this phenomenon in his book 'Drive', put it succinctly-the incentives had turned play into work. 2 At first, drawing was intrinsically fun and rewarding, but extrinsic rewards had taken over.