Usually the whole is the sum of its parts (added linearly): someone is happy and travelling, so happy travelling. Someone walks across a motionless and stable bridge and thus moves forward. But when hundreds of people walk together, the bridge may start to wobble quite suddenly. Both systems - the pedestrian …

Experimental setup of motivating physiotherapy clients to perform balancing exercises at home through the use of a game with custom ‘wobble board’ hardware and iPadaccelerometer data.