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The study was performed with Year 5 schoolchildren ($n = 32$) from Bigyn Primary School in Llanelli. They were divided into 10 groups, where each group was assigned a uniquely distinguishable colour to represent their group on the ambient display. Flexible LED lighting was installed along the bookshelf in the front of the classroom.   {\bf THIS IS TOO MUCH DETAIL ABOUT THE STUDY IN THE INTRODUCTION-> A SEPARATE SECTION BEFORE THE HARDWARE WOULD BE A GOOD PLACE.}  The display was connected via a microcontroller to the school's computer network. Activity monitor data were retrieved from the Fitbit website and displayed with moving colour segments, where different colours were used to represent the various teams. The teams could make their colour segment go faster by increasing their number of steps. The team's colour would start to flash if the spent more time being active than the previous day.  For the missions, ideas were elicited directly from the schoolchildren, with a brainstorming activity performed at the school. These ideas were then refined by the project team and turned into four activity-based missions.