This multi-purpose classroom has desks and chairs on one side, and stage and cushions on the other. In such a large space, it is composed of different concepts and themes, so that folding doors are installed in the middle of it so that classes can be conducted efficiently.​

Even if the class is divided into spaces, it will not interfere with the progress of the two classes by processing half of the translucent sheet. Overall, if the translucent effect is given, it may be less opaque than opaque, but a little stuffy, so the interior effect has been enhanced along with a bright class space with half-post-processing construction rather than the whole.As a folding door with a good soundproof effect, the hallway and separation are sure to increase the concentration of the class.

In many schools, corridors are often made of small windows along with opaque walls. However, due to the nature of the multi-purpose class, which has fun and lively hands-on learning, the wide window of the folding door rather than stuffy with the opaque wall created an atmosphere of fun class time.​

Although the inside is completely open due to the transparent glass window of the folding door, Incheon Cheonghak Elementary School has increased the concentration of students taking classes by post-processing with translucent sheet paper up to half of the folding door's glass window.​

In addition, through translucent post-processing work, the corridor was blocked from being disturbed in other spaces.