Abstract. I like it. It looks like your single line (there are many) is the bolder one running diagonal from the top left. I hope that's not lost on other voters. Good luck!
"Create a photo in which a single line of some sort is the main subject"
I like this photo very much, but it doesn't meet the challenge, IMO. There are many lines, and not one stands out as the subject.
The waviness of them is terrific, though.