A structure, in particular for protection against impacts or for support, the structure comprising an assembly of blocks and at least one connecting element (20, 25A, 25B), the blocks being distributed across a plurality of levels (N1, N2, N3, N4) superimposed in a vertical direction, each block having an upper face and a lower face, each block having at least two axes parallel to the vertical direction, each block comprising, for each axis, a protuberance, a duct and a cavity, each protuberance being formed on the upper face, each cavity being formed on the lower face, each cavity having a bottom delimiting the cavity in the vertical direction, each duct extending along the corresponding axis and being delimited by the block, each duct passing through the block in the vertical direction and emerging in the corresponding first cavity, each cavity of a block belonging to a level of blocks (N2, N3, N4) different from the lowest level accommodating a protuberance of a block of a level (N1, N2, N3, N4) of blocks immediately below the block in question, the axis of the cavity coinciding with the axis of the protuberance accommodated in the cavity, the structure being such that each protuberance and the cavity in which said protuberance is accommodated are configured to allow relative rotation about the axis of the protuberance between the block comprising the protuberance and the block comprising the cavity, at least one connecting element (20, 25A, 25B) being received jointly in both ducts, the connecting element (20, 25A, 25B) being configured to block at least one degree of freedom between the blocks in which the connecting element (20, 25A, 25B) is accommodated, said structure is characterised in that the protuberance comprises a plurality of projections arranged along a circle centred on the axis of the protuberance, each projection extending in the vertical direction from the upper face. each block having at least two axes parallel to the vertical direction, each block comprising, for each axis, a protuberance, a duct and a cavity, each protuberance being formed on the upper face, each cavity being formed on the lower face, each cavity having a bottom delimiting the cavity in the vertical direction, each duct extending along the corresponding axis and being delimited by the block, each duct passing through the block in the vertical direction and emerging in the corresponding first cavity, each cavity of a block belonging to a level of blocks (N2, N3, N4) different from the lowest level accommodating a protuberance of a block of a level (N1, N2, N3, N4) of blocks immediately below the block in question, the axis of the cavity coinciding with the axis of the protuberance accommodated in the cavity, the structure being such that each protuberance and the cavity in which said protuberance is accommodated are configured to allow relative rotation about the axis of the protuberance between the block comprising the protuberance and the block comprising the cavity, at least one connecting element (20, 25A, 25B) being received jointly in both ducts, the connecting element (20, 25A, 25B) being configured to block at least one degree of freedom between the blocks in which the connecting element (20, 25A, 25B) is accommodated, said structure is characterised in that the protuberance comprises a plurality of projections arranged along a circle centred on the axis of the protuberance, each projection extending in the vertical direction from the upper face.