Art is related to the words artificial, artifice. It originally meant something which reproduced reality, such as a painting of a person. After the 19th century the meaning changed. Because of photography, painting was no longer expected to represent reality. The word art came to mean something which satisfied an inner need, of both the artist and the viewer. I have trouble seeing well laid cement as art, but in the trump era, words no longer have meaning. Say anything, call something anything; nobody will believe you. It seems we are experiencing a breakdown of verbal communication. So if you want to call your fart art, it is OK.