File:Pile of used wooden pipes from regrading operation showing triangular shape of interior walls resulting from being turned three (SEATTLE 5585).jpg
Pile_of_used_wooden_pipes_from_regrading_operation_showing_triangular_shape_of_interior_walls_resulting_from_being_turned_three_(SEATTLE_5585).jpg (364 × 600 pixels, file size: 25 KB, MIME type: image/jpeg)