R.Crumb made me do it...

Robert Crumb revealed in his eponymous documentary that he kept a sketch book of power lines and telephone poles to aid in realistic rendering in his sketches. I think he was very successful. Below my two powerline photos, I've included a Crumb sketch including said details.

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Artwork above, copyright (c) Robert Crumb, who's work is on display at the Yerba Buena Center for the Arts in San Francisco through July 8, 2007.