South Korean designer Youngmin Kang has created ODDLY, a simple and unique bookshelf designed like a see-saw, with a wooden ball that rolls depending on where the weight on the shelf is.
The design, which comes in brass or black or white painted steel, is paired with a walnut base and ball. Each individual wood ball has been hand-turned to perfectly fit the rail that it sits on.
Watch the video below to see it being used.