Which artist is known for the piece created on October 19, 1981, titled "Untitled"?

The artist known for the piece titled "Untitled," created on October 19, 1981, is indeed Keith Haring. Haring was a prominent figure in the art world, especially during the 1980s, known for his unique style characterized by bold lines and vibrant colors. His work often conveyed social and political messages, reflecting themes like love, sexuality, and the fight against AIDS.

"Untitled" refers to a piece that exemplifies Haring's signature aesthetic, which incorporates elements of street art and pop culture. His imagery often includes radiating babies, barking dogs, and dancing figures, all crafted within a playful yet impactful framework. Haring's ability to engage the viewer through simple yet meaningful visuals has made his works not only significant in art history but also relevant in discussions about contemporary social issues.

In contrast, the other artists listed have their distinct styles and contributions to art, but they are not associated with the specific piece created on the date mentioned. This emphasizes the importance of recognizing Haring's unique contributions to the art of that era.