The phrase "hangs there" implies a state of suspension or inactivity, but there are several antonyms that can be used to convey the opposite meaning. Words such as "moves," "flows," "runs," and "pulses" are excellent choices to indicate a sense of energy and activity. Other antonyms might include "stands," "sits," "rests," or "lies," which all suggest a state of stillness rather than motion. Depending on the context, other adjectives such as "dances," "sways," "twirls," or "bounces" might also be used to convey a more lively or playful vibe. Ultimately, the choice of antonym will depend on the desired tone and emphasis of the sentence in question.