Mom, is that a ghost outside my window? No, it's the work of French artist Cédric Le Borgne and he's been installing chicken-wire men in public places around the world. Le Borgne describes himself as a "perfectionist, an intransigent artist who also works within the dimension of time," so there's a brief insight into why one might embark on such a project. His "voyageurs" exist to abolish barriers, make people think about space in new ways and to evoke poetic thought from all those who see it. That is, all those who don't first have a heart attack when they see a translucent man above their window.
In more recent projects, Le Borgne has also been building animals:
You can see more of his work on Cedric Le Borgne's Website.