Tatsuo Nakajima presents research on designing ambient persuasive expressions to motivate desirable lifestyles. The research aims to change behaviors through subtle feedback displayed on ambient displays, like aquariums or pictures, based on passive observation of behaviors through smart objects. Case studies include a virtual aquarium that provides positive feedback like dancing fish when toothbrushing well, and negative feedback like a dirty aquarium for poor brushing. A second case uses a Mona Lisa bookshelf that remains beautiful and whole for cleaning public spaces and deteriorates without such actions. User studies found these ambient displays successfully motivated sustained behaviors.