abstract appearance background brown colored coloring colors coloured colouring colours contours contrast contrasts cracks fissures flaws grit gritty layered layers levels light lines natural ribbons rock rock-face rockface rocky rough rugged sandstone sandy shade shades of color shades of colour shadows shape shaped shapes stone strata stratum sunlight sunny sunshine surface surfaces texture textured textures veins wallpaper compare comparison cooking culinary cultivars dicotyledonous edible enormous food gigantic golden-sweet-potato healthy herbaceous-perennial-vine ipomoea-batatas kūmara kūmera large nutritional nutritious plant popular purple raw root root-vegetable size Sizes skin-colours skins starchy sweet-potato sweet-potatoes tuber tuberous uncooked varieties vegetable vine