The wall (2) is freely suspended to hang from a bar (3) which is held in a bracket (4) at the opposite end to the wall. The bar is situated rotatably about a vertical axis (5) passing through the bracket. The wall is located about a vertical axis (6) and is rotatable with respect to the bar. The wall is hung from a holder (15) secured to the bar. The wall has a curved shape with several hinged pieces, such as a central piece (9) with side walls (10,11).
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