Black Elements House of Mystery by Bertil Vallien, Kosta Boda. The sculpture has a black base and a pyramid-like shape. The head in the sculpture can be seen from all angles and creates a 3D like effect. House of Mystery is a beautiful sculpture with a hand painted face in the middle, the sculpture is handmade in Kosta, Sweden so the variation in colors and shapes can occur. It is precisely the differences that create a personality in the work of art.