angled angles arranged arrangement casual chaotic clamping clamps connected connectors disorderly disorganized engineering haphazard hollow irregular metal metalwork nuts-and-bolts pile piled pipes piping plumbing random rust rusting steel surfaces surfacing textured textures thread threading uneven unmethodical unsystematic variations variety weathered abstract architectural architecture background barrier basic brick brick-wall bricks color colors colour colours crack cracked cracks damage damaged danger deterioration exterior external garden lean leaning retaining-wall solid split-levels splitting standard strained strength surface texture wall appearances arid Cacti cactus clumps clusters coloring colouring display edge edges flora garden-display garden-plants leaves light ornamental perennials plants pointed protection shape shapes sharp short-spikes small-spines spikes spines spiny succulents unusual