advice alert announcement appropriate-behavior appropriate-behaviour be-careful beware care careful caution color coloration colored colorful colors colour coloured colourful colours communicating communication concern danger dangerous directions hiking informing Look looking lookout observant paths risk risks risky safety sign signs tracks walk walking walking-paths walking-tracks warning warning-sign watch watch-out abstract backdrop background bar building cladding construction design grey industrial light macro metal metallic modern pattern plate reflection reflections regular round shape shine shining shiny steel structure structures texture textures wallpaper autumn blooming blossom blossoms botanic close-up contrasts dahlia flower flower bed flower head flowers high contrast nature petal petals pink plant plants purple rose roses Single Flower summer white atmospheric bright brilliant glare gleam glow glowing gold golden green soft black chaos flame flames Fractal fractals mystic space universe angles appearance blue dark darkened decorative interconnected interwoven lighting lit peace peaceful perspective perspectives reflected ripples river riverside shadows textured views water blended circle circles circular merge merged merging patterns red shaped style thick thin vibrant aspen colorado fall leaf leaves mountain mountains tree trees adlershof architecture berlin business creeper facade facade greening germany green facade greening ivy multicolored multicoloured natural overgrow overgrown shapes square chrome contrast contrasting display feature fragmentary fragments glass mosaic mosaics pieces pillar reflecting smooth surface surfaces