Klaus Littmann’s “Arena for a Tree” is an art intervention that is visually and physically open and accessible, both internally and externally. It offers seating for 50 people, with a view of the main actor in the centre. Twelve metres in diameter, the exhibit is in the shape of a bowl constructed of a loose wooden meshwork that protectively encloses the tree – eight meters high, extending beyond the topmost branches. The irregular shape and structure of the individual slats forming the outer meshwork is modelled on the appearance of a tree. Together with the seating that runs around the inside of the bowl, the slats symbolically replicate annual growth rings – the lifespan of a tree.