Rock Flower (1986) Charles Simonds, Raw clay mixed with nylon thread, and sand in masonite box, 10 1/2 x 24 3/8 x 24 1/8 in. (26.7 x 61.9 x 61.2 cm) Hirshhorn Museum and Sculpture Garden.
The rock dwelling in Hirschhorn is art, because Hirschhorn nis a museum of art, and Charles Simons is an artist.
The Black house from Skye is a masterpiece of rock building. What is the difference? The power of the art-establishment to declare something art and excluding other works as non-art.
The artist has to enter the art-establishment to get permission to name his works art. Schools of art are a ways to enter the art establishment.
Put it in a museum, declare the maker an artist, write a description of the piece in papers and books.