A folded ceiling baffle constructed from a sheet of felt, the baffle , in its folded state, including: an elongate base having an elongate first edge and an elongate second edge opposite to the elongate first edge ; a first elongate side folded from the elongate base and extending from the first edge to a first top edge ; a second elongate side folded from the elongate base and extending from the second edge to a second top edge , the second elongate side facing the first elongate side ; a first top portion folded from the first elongate side and extending from the first top edge ; a second top portion folded from the second elongate side extending from the second top edge towards the first top portion ; a planar first end part folded from the first elongate side at one end of the baffle and extending from a first side edge of the first elongate side to a first inner edge ; a planar second end part folded from the second elongate side at the one end of the baffle , extending from a second side edge of the second elongate side to a second inner edge , and aligning with the first inner edge so that the first and second end parts are coplanar in order to together form a planar end portion at the one end of the baffle ; characterised in that : the first end part includes a protrusion extending from the first inner edge and coplanar with the first end part ; the second end part includes a space extending inwardly from the second inner edge ; and the protrusion is received in the space and retains the first end part and the second end part together to form the planar end portion . an elongate base having an elongate first edge and an elongate second edge opposite to the elongate first edge ; a first elongate side folded from the elongate base and extending from the first edge to a first top edge ; a second elongate side folded from the elongate base and extending from the second edge to a second top edge , the second elongate side facing the first elongate side ; a first top portion folded from the first elongate side and extending from the first top edge ; a second top portion folded from the second elongate side extending from the second top edge towards the first top portion ; a planar first end part folded from the first elongate side at one end of the baffle and extending from a first side edge of the first elongate side to a first inner edge ; a planar second end part folded from the second elongate side at the one end of the baffle , extending from a second side edge of the second elongate side to a second inner edge , and aligning with the first inner edge so that the first and second end parts are coplanar in order to together form a planar end portion at the one end of the baffle ; characterised in that : the first end part includes a protrusion extending from the first inner edge and coplanar with the first end part ; the second end part includes a space extending inwardly from the second inner edge ; and the protrusion is received in the space and retains the first end part and the second end part together to form the planar end portion . the first end part includes a protrusion extending from the first inner edge and coplanar with the first end part ; the second end part includes a space extending inwardly from the second inner edge ; and the protrusion is received in the space and retains the first end part and the second end part together to form the planar end portion . <EOS>