Almost Invisible Mirrored Treehouse Built in Sweden

In Sweden, 40 miles south of the Artic Circle, these "invisible treehouses" are being installed to create a six unit tree hotel.  This idea is pretty cool, but there are a few issues that seem to be rediculous.  For instance, they use an incenerating toilet deep in the woods (instead of Charles's composting toilets).  Also, they claim that a film will be applied to the walls of the unit, making it able to be seen by birds.  If you would like to read about this invisible treehouse, click on the link below.
Invisible Treehouse