advice alert appropriate-behavior appropriate-behaviour background black care caution close-up colors colours communication concern danger dangerous directions distinctive external greenery hazard hazardous hazardous-pathway message path-warning-sign safety shade shadows sign signage sunlight tree trees trip-warning tripping-up uneven vegetation walking-hazard warning warning-sign yellow abstract aerial-roots banyan banyan-tree clinging competing competitive contours groundcover growing growth interconnected interlinked intertwined interwoven layers leaves root-system Roots spread spreading strangling surface surfaced surfaces texture textured textures tropical twisted twisting woody