THE TRIPLE DOOR 216 Union St, 838-4333 The Triple Door is the most enchanting bar in the downtown area. The sense of enchantment is derived not from its extravagant interiors, but the way the bar seems completely displaced. The massive fish aquarium, the human aquariums, the stage with too many twinkling stars--it's all wonderfully not Seattle. There is, however, a flaw at the bottom of this golden bowl of a place: Unless you check before leaving home or office, it's hard to determine if the bar is open to the public or shut down for a private function. CHARLES MUDEDE