I have been around horses and seen all sorts of fencing and, all sorts of injuries from said fencing!
Saw a yearling colt with an oak rail driven through his chest and sticking out by his elbow, nasty wire injuries if you have horses and whatever fencing you can bet that there has been a bad experience with it!
To me a paddock is when a larger field is divided into sections and each section becomes a paddock.
We had stock netting around the outside of each field with a high tensile wire, electrified, off set so it stuck into the field to keep the horses off the netting.
Each field was divided into paddocks, these were with wood posts driven into the ground and electro rope, two strands, around each paddocks.
I much preferred the rope to tape as the tape, regardless of fitments, would break at the fitments in the wind.
The rope so so easy to put up, as you can get screw in fitments that go into the posts and the rope runs through it.
All the fencing was electrified from the mains. The horses all respected it.
As for being visible, horses are perfectly capable of seeing a single piece of string!
I was at a clinic years ago and the question came up of what they can see in the way of fencing. The man taking the clinic put a piece of brown parcel string across two jump stands and had us jump it. Not one horse touched it though obviously they wouldn't respect it for very long. (Had any horse hit it the string would have broken.)
I never had any posts concreted in unless they were metal. The concrete holds the moisture in and rots the posts out eventually. As said old telegraph poles make good gate and straining posts. They need to be well dug in.
The good thing about the electro rope is that it doesn't put a lot of strain on the corners.