Cropped from <a rel="nofollow" class="external free" href="https://www.flickr.com/photos/jeffchristiansen/2627360818">https://www.flickr.com/photos/jeffchristiansen/2627360818</a> (contrast adjusted).
Jeff Christiansen
CC BY-SA 2.0
<a rel="nofollow" class="external free" href="https://www.flickr.com/photos/jeffchristiansen/2627360818">https://www.flickr.com/photos/jeffchristiansen/2627360818</a>