Multi-directional optical elements are disclosed that include a body
having a first side having a first curvature, a second side having a
second curvature, a third side having a third curvature, and a fourth
side having a fourth curvature. The second side is disposed generally
opposite the first side along a first direction and a fourth side is
disposed generally opposite the third side along a second direction, the
second direction being different from the first direction. Also disclosed
are optical systems utilizing such multi-directional optical elements.