KLARA LIDEN - "Pretty Vacant" - NYTimes.com 165 East Broadway, Lower East Side Through Feb. 19 In the house of art there are the grown-ups (collectors, dealers, curators, critics and administrators), and there are the children (the artists), who run around madly vying for attention. One of the cutest of the kids these days is Klara Liden, 33, a Swedish wild thing whose creative impudence has rocketed her to international celebrity since her first solo exhibition at this gallery seven years ago. This spring she will have a solo exhibition at the New Museum. Ms. Liden's most memorable works were two short videos, one in which she danced with the awkward abandon of a feral moppet in a subway car and another in which she beat a bicycle with a metal pipe. Ms. Liden creates installations that involve quasi-secret spaces the way children build forts out of pillows in their bedrooms. For this show she erected a blue wall across the gallery space with a door admitting visitors into a room filled with 80 used Christmas trees taken from the streets of New York. A path leads to an old sofa where you may sit and bask in the piney scent that fills the room. A key to Ms. Liden's motivation is in a photographic flip book that shows her descending through urban manholes into unknown lower depths. She seems driven to return to the maternal womb. This is interesting and poignant. But it is silly to judge what she does on any conventional scale of artistic quality, although she is off the chart when it comes to charismatic coolness. Like a punk rock star she is a force of nature in her own right.