For the current eye of the beholder challenge -- dental floss -- actually dental tape. I love the Glide floss, but I somehow had a package of the wider Glide tape. I disliked the extra effort it took to get it in between the closely spaced teeth so, since I had plenty of the good stuff, I was about to throw this away when I decided to use it up in the pursuit of abstract art. Stretched across the glass door that leads from kitchen to back porch. This was taken from inside with a light below and to the side.
