Meaning of "3121" by Prince

The song "3121" by Prince seems to paint a picture of a hedonistic and decadent party where guests are promised endless fun and excitement but are also trapped in a cycle of indulgence and excess. The repetition of the invitation to come to the party, coupled with the warning that guests can never leave, suggests a sense of eternal pleasure but also a probable sense of entrapment. The references to luxurious amenities like Japanese robes and champagne hint at extravagance, while the comparison of butterflies dancing in the belly to a ballerina suggests a feeling of restlessness and anticipation. The mention of partying like there won't be another one and the futuristic fantasy nature of the event add an element of escapism and surrealism to the narrative. Overall, the lyrics seem to be a whimsical yet cautionary tale about the allure and potential dangers of indulgence and endless partying.