For our ranch, the pipe posts every 100 ft were entirely painted purple from top to bottom.

Big, tall, girthy, permanent, tornado-resistant, heavy metal pipes, dipped in purple paint; top-to-bottom.

Really stands out nicely against the natural greens and browns in that area.

Can't miss it!

Much more efficient than "No Trespassing" signs that tend to be shot at by passing-by drivers, or end up in need of repair/replacement at some point.

Purple, thick metal posts will outlive us both, for when the nieces and nephews inherit the place.

The saying out here, I've discovered, is roughly "Once the fences go up, all the problems tend to just go away"

People get a bit strange when multi-generational structures get torn down and renewed.

Fuck me for building them a new fence, right?

*shurg*

EDIT: Example drone shots from the ranch border showing how the purple pipes are laid out.