abstract appearance background brown colored coloring colors coloured colouring colours conglomerate contours contrast contrasts cracks fissures flaws grit gritty layered layers levels light lines mica natural rock rock-face rockface rocky rough rugged shade shadows shape shapes silicate stone strata stratum sunlight sunny sunshine surfaces texture textured textures veins wallpaper shaped surface aeroplane aircraft airplane angled angles atmosphere blue bright changing cloud clouds color colorful colour colourful contrasting dark dark-clouds darkening darkness distant disturbing dramatic dusk evening foreboding formations gray grey lighting moody nature plane rays silhouettes skies sky sloping threatening trees weather white wild