Place diorama dolls and combine things around you to create a city that looks like it. By deliberately choosing an elaborately made diorama doll, we focus on the recognition of space and size, such that a 50 cm desk transforms into a vast ground of about 500 m just by its arrangement. We will prepare materials for introduction, but gradually encourage them to spread to things around the venue, floors, walls, window edges, and so on. Children's interests naturally enter their living sphere and trigger a change in their perception of everyday space.