abstract appearance background brown colored coloring colors coloured colouring colours conglomerate contours contrast contrasts cracks fissures flaws grit gritty layered layers levels light lines natural rock rock-face rockface rocky rough rugged shade shadows shape shaped shapes stone strata stratum sunlight sunny sunshine surface surfaces texture textured textures veins wallpaper angles appearances architectural architecture box-like buildings business-district CBD circular city city-scapes city-views concrete contemporary contrasting distance distant elements exterior external glass heights high high-rise linear modern office-buildings perspectives photographer reflections round rounded Singapore skyscrapers style views walls wealth windows mica silicate