Analog interactive installation by Karina Smigla-Bobinski

What do you get when you take a giant helium-filled sphere, some sticks of charcoal, and a small white room? Well, as this installation by German artist Karina Smigla-Bobinski shows, you end up with a seriously cool piece of art. Visitors are encouraged to push the sphere around the room, as the sticks of charcoal attached to the outside rub and brush along the walls to create a series of swooping patters and swirling lines.