Has the Law of Gravity been put in the back seat? No, this chair a clever optical illusion, with its apparent shadow actually functioning as its base — it's part of the chair's metal frame.
We'd have to see this chair in various lighting situations to know for sure if it's an effective illusion or not. But judging from these photos, it's just downright eerie.
One thing that's not an illusion about this chair is the €795 ($1057) of cold hard cash you'll have to plop down to possess one.