In the past 20 years, hundreds of shooting incidents have occurred in schools across the United States and have increased year by year. This passive safety design can make it difficult for people to see. At the same time can buy time and self-protection. The overall planning is based on "playable space", which can not only be used as a play space for children of different age groups, but also the final planning can be shaped according to the campus, environment, and users of different spaces to create a variety of installation designs.