The calligraphy on the left is pronounced "Mu" in Japanese. It is an expression often used in Zen and it points to that which is without name, without form, without limitations or definitions. It transcends time and space and yet presents itself freely as everything but is not a thing. It is the one reading this now and yet it is formless. We keep searching for it and are complaining that it is hidden and yet it is constantly revealed.
But as Master Rinzai admonishes us:
"There is no end to talking about it. You'll just have to see it for yourselves."
Calligraphy: Shaku Daijo