It's sometimes disappointing, when people do not know how to appreciate art works. To some, it's just a fish tank with some stones and plants. They know nothing about composition of the stones and plants, choice of stones, plants and fish. They don't know how important imagination is in art: they can get why a few pieces of stones symbolize an epic landscape.
Well, it's definitely not a masterpiece; it can only be loosely classified as a piece of art (because of the little effort and time spent on placing the stones in a less casual way); I am an ameteur but it's not a fish tank with a few pieces of stones.