It has become vogue to make small rivers or streams in the heart of the metropolis. This idea originated in the Cheonggye Stream project. Though there were some before that. These streams have become a resting place for people, who are tired of city life. Additionally, it helps protect the natural environment. For example, it helps the City’s atmospheric temperature to fall. There are also many kinds of fish, shellfish, and insects living in the stream, as water purifying plants take root in the stream. Therefore, maybe it is not just vogue, maybe it represents the hope that people have wished for long time but could not take in easily.