It is an old architectural trick used since the invention of mirrored glass: covering buildings with the reflective material and declaring that they blend in with the surroundings. Most architects use it to convince wary citizens that it is OK if their building is tall because it will reflect the sky and nature. The rendering always makes the building disappear, and the reality is always a big clunky mirrored box.
But a mirrored box can be elegant, too, such as this treehouse by Swedish firm Tham & Videgard Hansson Arkitekter. TreeHugger loves treehouses (see ourroundup of them here) when they are designed to minimize impact on the surrounding landscape. And in this case, it looks like the architects have pulled it off successfully.