When you are visiting Korean traditional house in Seoul, you will see many lanterns hanging around the courtyard. These lanterns are red and blue in color.
The name of the red-blue lantern is cheongsachorong. It was displayed during festivals and reception of distinguished guests in the old times. The frame of cheongsachorong is made of iron or wood. The red color of the lampshade represents sky and the blue color symbolizes earth. Between red and blue means mankind.