Swedish hotel "Treehotel" located in the forests of the Northern part of the country, consists of several individual cabins, mounted on wood. One of the houses-rooms, called the Mirrorcube, is a made of aluminum structure cube measuring 4x4x4 meters, covered outside mirror panels. So the birds are not faced with the walls of the cube, they are covered with special infrared film, invisible to humans but visible to birds. Interior trim is made using birch plywood, which contributes to a healthy indoor climate. In addition to rooms for rest, the room has a bathroom and a small terrace on the roof.