This work is made with acrylic paint and pen on foamed polystyrene. The case is made of wood and polystyrene. This work has the appearance of a puzzle. Lines attached by playing dripping acrylic paint and string. The letters are concave on the border of the flat surface. They remain in the work as marks and phenomena created by dripping, playing, and brush pressure. There is a margin of the base of the work. It is a gap, and the space is expressed as an inner boundary. Acrylic spray is used for the fine dots seen on the surface. The presence of lines is captured by the wrapping that contains the disparate pieces. And it is the out letters arranged as the outside of the main thing that form the inside as a result. In the process of creating this work, I had a change of heart, a transition, and felt the ambiguity and connection between the inside and the outside, which led me to feel things like subjectivity and objectivity, room and territory. This is why I think that this work evokes both the image of water flowing outdoors and the calm atmosphere of an indoor space. The material polystyrene foam is light, soft, and delicate, making it difficult to handle, but it gives the work a soft impression. Also, the countless air bubbles inside the structure are interesting from a spatial point of view.