A screen (10) includes a support structure (12). A plurality of screening elements (18, 20) is arranged in spaced relationship on the support structure to define screening apertures (22) between adjacent screening elements (18, 20). Each screening element (18, 20) defines a screening surface (24, 26), respectively. The screening surface (24) of each of at least some of the screening elements 18 are spaced further from the support structure 14 than the screening surface (26) of each of the remaining screening elements (20) so that, on opposed sides of each screening aperture (22) associated with the at least some of the screening elements (18), the screening surfaces (24, 26) are at different heights.