Years ago, when researching an article we published on amazing tree houses, we discovered some concept renderings for a mirror cube treehouse in Sweden. Years later, the cube finally exists as part of Treehotel, a collection of wildly imaginative tree houses in Harads, Sweden. The Mirror Cube, designed by Martin Videgard and Bolle Tham, is perched high in the trees overlooking a valley forest below. Its exterior is entirely lined with mirrors, appearing like a floating reflective cube amidst the pine trees. Its interior is surprisingly spacious, with a floor-level bed and a loft above.