Ghost is a novelty chess set. It is intended for display purposes since it is probably impractical for playing. I posted this on reddit to some acclaim, but I never got the motivation to get this manufactured. The picture has since popped up in various places on the internet, such as on this blog post.

Side view
FIGURE 1 Side view.
Front view of white pieces
FIGURE 2 Front view.
Stacked pieces
FIGURE 3 The thin shape of the pieces allows them to be efficiently stacked.