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 (62, 64) 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 (62, 64) 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.