Brains by Bertil Vallien, Kosta Boda is a classic and an anti-stress object for the hand, the eye, the desk or the trip. Brain's heads are something that symbolizes Bertil Vallien and have over the years become a symbol for the art glass created by Bertil Vallien. Today there are a number of different versions of the Brains series. Bertil Vallien says, the Brains series was created for an exhibition several years ago. Twenty-four glass sculptures by Brains were created through the story of a young woman named Karolina Olsson. Today, Brain's Karolina head is one of several heads created by Bertil Vallien. Kosta Boda.