In the past 40 years since the Reform and Opening-up, our cities have witnessed remarkable development. Our living standards have seen an unprecedented rise. This fastest-changing period is closely related to us. This exhibition will take Hengfu district as an example to provide an overview of this glorious 40 years. It is conceived as a record of these neighborhoods' changes, as well as an attempt of a new model of public participation. During the exhibition, we will invite the visitors to take part in the exhibition process with an open call: Please continue to search for historical materials that respond to the theme and convert them as a presentable piece in our exhibition. Together let's look back at the celebrated four decades and seek the sounds, images, and words that can represent the past. Together, let 's construct a history and build a future.