What is significant is that it has four pillars to make the stage as easy to view to the audience. With this set up, it’s easy to understand that everything is preferred in the open. The actors wear mask, their vision is reduced and so they have to rely on the pillars to guide themselves.
In Noh Theater the music that is played uses four instruments consisting of sometime of flute, bongo, and other percussion and woodwind instruments. They also have four chanters who chant along with the instruments. The chanters help the play out in being able to speak for the actors, due to the mask, its like this that melody and rhythm