airport angles architecture background Balearic Islands beams building ceiling elements girders glass iron majorca Mallorca modern palma roof Spain steel strength strong structural structure struts symmetrical symmetry terminal abstract appearances autumn breakthrough brown cluster danger Dirt dirty fragile fungi fungus grass grit gritty ground groundcover hardy nature plant plants poison poisonous shapes Soil toadstools abundance appearance bricks colors colours firm lifted loose pavers paving paving-bricks perspectives plenty quantity rough rows sandy solid stacked stacks surface surfaces textures dry dry-grass straw