Skew Lines

This photo is of a fence. Fences are used very commonly today, to mark property lines and separate crops. Fences are sometimes used as barriers, as seen in jails. However, fences demonstrates skew lines, because the vertical post does not intersect with the horizontal posts. The two different directions of posts are in two different planes, and are not parallel. This particular image was found at http://www.lowes.com/cd_Fence+Buying+Guide_976084218_, through google images.