angled angles architectural architecture Asian blue building closed coloring colouring exterior exterior-shutters external façade fixture functional louver-blades louvered louvers louvre-blades louvred louvres painted plantation-shutters protection rectangle rectangular shape shaped shapes shelter shut shuttered shutters style surface surfaces symmetrical symmetry traditional window-coverings window-frames window-shutters windows wood wooden abstract backgrounds bare bark brown bumps close-up colors colours contrast cracked cracks dark dry edge edges gnarled gray grey grooves layers light lined lines mottled patterns perspectives ridges rough shade shades-of-colour shadows strips sunlight texture textured textures tree tree-trunk trunk uneven wallpaper wrinkled wrinkles wrinkly variations varieties background beams culture cuts decorated decorative design elements iconic landmark line modern New norway norwegian opera house ornamental oslo pattern repeated repetition rods sequence series spars timbers variable variation wall branches branching Cacti cactus dangerous display fine flora flowering fruiting garden garden-plants green irregular leaf long multiple-branched perennial pointed points prickles Prickly protective risks sharp skin soft-wooded-perennial spikes spination spines spiny succulent sunshine to-the-point