This is a little bit 'idle curiousity', but I was wondering if anyone does? We do seem to have a lot of people with outrageously good views from their plots.
For non-landscape nerds a ha-ha is a sunken wall and a ditch used to give you an uninterrupted view of the landscape, but still keep livestock out. The only downside is that it doesn't keep the wind out.
I know quite a few people who have a hedge and a raised platform, which seems to be a modern alternative.
We used to have one at home where the garden level ran across a depression in the pasture, probably put in when the Georgians or the Victorians laid out the garden. It was where we eventually incorporated a stone hut for the Aquatron 'composting loo' to have it out of sight.
Very common in National Trust properties. Isn't there even a nod to these at the Badminton Horse Trials, with a fence called the "sunken wall"?
Ferdinand