SmileFlower talks about nostalgia where it's derived from the intersection of memory, desire and hope. Nostalgia is personal, subjective feelings which are developed being affected by factors such as environments, people arounds oneself and thoughts. We transposed the nostalgia formation process into design methodology. SmileFlower members visualize their own nostalgia on the empty spot and toss it to another. By repeating “add and subtract” process, we build our nostalgias