branch branches color december fence figure hidden hideblue human nest nimbus shadow silhouette smow storm sunset sweep twilight white abstract backdrop background blue colors colours curl Fractal gramps graphic green hippy paint picture poster psychadelic purple red ribbon sixties swirl wallpaper wave angles arm danger dangerous electricity elevated elevation equipment external height heights high hydraulics lifting machinery on-high perspectives power power-lines power-pole raised raising repair-crew replace replacement replacing risks risky safety service trucks up-high vehicles work workman workmen