5 photos one element

 Line 

Each of the 5 photos selected in this blog all correlate to a line. Each photo has some sort of line in the photo in the form of objects or the ground. In the first photo it is a bench in the shape of a line. The second photo is a tree straight up. Third is a pole with a sign on in saying cal high. Fourth is multiple rails in a line to let people hold onto. Last is a line in the ground where the soil area ends.