bauble baubles christmas cold exclude excluded Fir house light lights lit living outside pine room tinsel tree warm window winter yuletide angles araucaria heterophylla Australian conifer background black branches common conifer focus foliage living Christmas tree Norfolk pine ornamental outdoor plant prolific pyramid shape sepia shapes silhouette symmetrical textures color colour dense depth evergreen green greenery horizontal whorls incurved indoor plant lanceolate narrow leaves overlapping potted plant spikes spiky