This curtain lets the horses through but helps keep flies out.
Make A Twine Curtain
Tired of trashing heaps of baling twine? Recycle and re-use it! Here's one way:
For doorways, windows, shed entrances, and overhangs to help keep flies out
As horses walk through the hanging strings, flies are rubbed off them. The curtain filters out more light, deterring flies a little more. The strings let the horses through, but act almost like a screen to help keep flies out.
Heap of twine
Old rake/ broom handle, or dowel
2 pipe-mounting clamps, metal or plastic (optional)
Time and a friend
Tie one end of the string around the dowel and knot it. Use the knot end (if you cut the twine at the knot when you open the bales) because it looks neater and the string hangs freer. (If the knots interfere with spacing along the dowel, they can be trimmed off.)
Experiment with tying it in different tightnesses - you want to be able to slide the strings into position, but don't want them loose enough to be slid to one side by the horses or the wind.
Space the strings according to how sparse or thick of a curtain you want.
Mount the dowel to top of doorway or window with screw-in pipe mounts, or by tying it in place.
Old push-broom handle is mounted to framework with screw-in pipe clamps.
Plastic twine is slippery enough that it doesn't knot up; fiber twine tangles more readily so should be hung more sparsely.
Pipe clamps hold dowel tight to framework - this may or may not be desirable with your framework - a spacer could be used if needed.
Open bales by cutting the twine at the knot - you can pull the twine off by the knot, and it leaves a longer string for re-use.
Instead of piling twine during the winter, put up a dowel to tie it on, and by summer it will be a curtain.