The porous texture, dark color, and organic form of the piece allows it to be perceived as a rock. Mass is also a component of this piece that makes it resemble a rock because of the color (or shadow?) at the bottom making it seem heavy.
I attempted to research more about "Muso", the idea that there is no such a thing as acceptance or rejection, which lead me to find about the poet and garden designer MusÅ Soseki who influenced much to the japanese gardening culture. Surely as a poet he was a deep thinker, and as a garden designer he observed aesthetics. Both qualities of his must have lead to his idea of acceptance and rejection.
source: http://www.jgarden.org/biographies.asp?ID=21











