We performed 3D projection mapping on a monument (ribbon tree) designed and constructed by architect Kengo Kuma, which was installed at the entrance of Kyoei Sangyo Co., Ltd.'s new headquarters, to create a new entrance experience for visitors. The monument is a 3D piece of art that not only creates the entrance space, but also has multiple functions, such as a seating area for customers and a projection area, and the projection mapping, which diverges and expands the images from the wall onto the monument, created a performance that customers could experience as they walked around the space.