Abstract: A structure (1) for providing a physical or visual barrier comprises at least one post (2) mounted to a supporting surface and to which is secured at least one slat (8) by at least one wedge (10). The post (2) has a beam 31 (16) extending upwards from a footing. The beam (16) comprises at least one longitudinally extending plate which at least partially encloses a hollow (18). The beam has at least one plate that extends between opposite left and right sides (33, 34). The beam has at least one plate that extends between opposite front and rear sides (31, 32). The beam (16) is cut through by at least one slot (28) extending rearwards from the front side (31) part of the way towards the rear side (32). The slot (28) is configured to receive a portion of a slat (8) when inserted into the slot (28) in an insertion direction from the front side (31) of the beam (16). The slat (8) then extends laterally away from at least one of the sides (33, 34).