There is an amazing blog called Time of the Aquarius that I like to visit very often. The woman behind this blog is a very talented designer. She came up with the idea of creating a foldable playhouse that I adore. It is not on the market yet but I'll get it as soon as it comes out. The playhouse is made out of (birch) plywood so it can stay outside. It has clean lines which makes it easy to mix with the existing style of the room where you'll put it and it super easy to build, collapse and rebuilt. I am sold!
You can visit Time of the Aquarius right here.