Lips refer to the visible part of the mouth in humans and animals, located externally around the opening of the oral cavity. They are often associated with various functions such as speech, expression, and the sense of touch. In the context of the clue you provided, lips could be a prominent feature depicted in Man Ray's painting "Observatory Time".
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Prominent feature of Man Ray's painting "Observatory Time. Explanations are generated by AI and may be inaccurate.