construction dozer equipment mini-excavator sand tracked tracks beach colors colours grainy impressions indented light patterns shadow textures tire tracks tyre tracks Camber Sands clouds evening sea silhouette sun activity churned-up conservation conserving curved curving damage damaged damaging environment environmentally-unfriendly foot-prints gray grey impressed imprinted imprints marked marks off-road-driving over-printed prints rough safety soft-sand surface surfaced surfaces tangled terrain texture textured tire-tracks track tyre-tracks vehicle-tracks vehicles wild Sardinia white grain grains land nature transportation truck footprints seashore steps summer evidence Soil work workplace