abstract architecture background clinch Dirt dirty element elements gray metal metallic panel panels rhombus rivet rivets rust rusty saavem sand sanded spoil spoiled steel texture white beach complex curves pattern rill ripple sculpted waves wet black churned-up dark distinctive foot-prints frame grainy grey impressed impressions imprinted imprints indented indistinct light lines marked marks patterns prints rough shadow-lines shadows soft soft-sand sunlight sunshine surface surfaced surfaces terrain textured textures tracks unfocused vague coast ocean playa river sea shore water Nyberg plaster stone stones wall yellow earth ground land Soil wallpaper natural concrete grain ice construction rock rocks sandstone