Merriam-Webster’s Collegiate Dictionary 11th Edition defines art as, “4a: the conscious use of skill and creative imagination esp. in the production of aesthetic objects; also: works so produced.” Webster’s New Explorer Dictionary and Thesaurus defines art as, “4: the use of skill and imagination in the production of things of beauty. . .” Therefore, according to humanity’s definition of art, extraterrestrials would need skill and imagination for them to produce art. As the saying goes, “Beauty is in the eye of the beholder.” Beauty to an extraterrestrial may be horrible ugliness to humankind.
Ensconced in dusty drawers at the Museum of Natural History, Dusable Museum of African American History and the Museum of Science and Industry are certainly some odd-looking sculptures and thingamajigs that museum personnel may or may not have displayed. Are these the products of alien imagination and skill? Did extraterrestrials drop these objects into our atmosphere, or did they land and bury them?
Scientists’ questions, when querying extraterrestrials, will certainly concern physics (space travel), possible weapons’ applications and medicine (biogenesis, etc.). If officials allow philosophers to question extraterrestrials, they are likely to ask ontological questions. As for art, in neither version (2008 and 1951) of The Day the Earth Stood Still did scientists (or artists) ask questions about alien art. (I consider this movie a very good example of how humanity would react if an extraterrestrial should land overtly.)
To develop art, aliens would need to be intelligent and sentient. Their intelligence would need to be greater than our own because they would require that level to travel to Earth from wherever. However, it is possible that extraterrestrials would consider as art just the process of traveling to this planet.
The pyramids are still a mystery, even if we have figured out how their construction progressed. Are, or were, they a means of traveling faster than light? Did only pharaohs have tickets on these trans luminal conveyances?
Extraterrestrial art exhibits are certainly possible. However, whether such art exhibits are probable is unanswerable because humanity does not know how many intelligent and sentient, extraterrestrial species exist. An alien artist should get his own, earthly, television network, maybe Ooze TV, or have his own website, maybe Out There. (If either this TV network or website already exists, it is just a coincidence.)