Aircraft cabin, comprising: a primary structure; a secondary aircraft cabin structure; a plurality of interconnecting struts coupling the primary structure to the secondary aircraft cabin structure, each of the plurality of interconnecting struts comprising engaging members (21, 22) at the respective end portions for insertion into strut holding fixtures of corresponding rotary joints attached at each opposing end, each of the rotary joints comprising: an outer shell segment having an outer shape of a segment of a solid of revolution, the outer shell segment having an opening arranged in an outer surface of the outer shell segment; an inner shell segment having the outer shape of the segment of the solid of revolution of the outer shell segment, the inner shell segment being aligned concentrically with the outer shell segment and spaced apart from the outer shell segment by a compensation gap; and a strut holding fixture having a hollow interior and a flange portion and being arranged in the opening so that the flange portion extends within the compensation gap between the inner shell segment and the outer shell segment; wherein the primary structure comprises at least one fuselage element; wherein the secondary aircraft cabin structure comprises a cabin partition element; and wherein the secondary aircraft cabin structure is fully decoupled from the primary structure element to which it is attached. a primary structure; a secondary aircraft cabin structure; a plurality of interconnecting struts coupling the primary structure to the secondary aircraft cabin structure, each of the plurality of interconnecting struts comprising engaging members (21, 22) at the respective end portions for insertion into strut holding fixtures of corresponding rotary joints attached at each opposing end, each of the rotary joints comprising: an outer shell segment having an outer shape of a segment of a solid of revolution, the outer shell segment having an opening arranged in an outer surface of the outer shell segment; an inner shell segment having the outer shape of the segment of the solid of revolution of the outer shell segment, the inner shell segment being aligned concentrically with the outer shell segment and spaced apart from the outer shell segment by a compensation gap; and a strut holding fixture having a hollow interior and a flange portion and being arranged in the opening so that the flange portion extends within the compensation gap between the inner shell segment and the outer shell segment; an outer shell segment having an outer shape of a segment of a solid of revolution, the outer shell segment having an opening arranged in an outer surface of the outer shell segment; an inner shell segment having the outer shape of the segment of the solid of revolution of the outer shell segment, the inner shell segment being aligned concentrically with the outer shell segment and spaced apart from the outer shell segment by a compensation gap; and a strut holding fixture having a hollow interior and a flange portion and being arranged in the opening so that the flange portion extends within the compensation gap between the inner shell segment and the outer shell segment; wherein the primary structure comprises at least one fuselage element; wherein the secondary aircraft cabin structure comprises a cabin partition element; and wherein the secondary aircraft cabin structure is fully decoupled from the primary structure element to which it is attached.