MAST is an eco-humidifier that utilizes natural evaporation instead of electrical power. MAST has a sailboat-like shape and draws moisture in the air with the sails, and naturally releases it into dry air together with the refreshing aroma of cypress. For the sail part, we use wood shavings derived from the process of Masu box making, which are usually discarded. The boat part is assembled by using the Masu box manufacturing method. Fill the boat with water, and the sails absorb moisture and let it evaporate naturally. It looks like a sailboat floating on water, giving a visually refreshing feeling.