Never really looked at barbed wire all that closely. It has a rather interesting - and I'm sure painful - pattern, especially against a blurry leafy background. This particular barbed wire surrounds a Marine Reserve Headquarters in the Albany Park neighborhood. We were exploring a section of the Chicago River in search of birds. Saw a lot of finches, some herons, and a very camera-shy Belted Kingfisher. Also saw a number of very brave kayakers. They are brave because the river is not too clean in this section.