On 10/03/2020 11:11, Chris J Dixon wrote:
Roger Hayter wrote:

I've seen old garden/estate walls built parallel to ground level,
following at least about one in twenty slopes. In a hilly part of the
country this probably would not work.

Indeed so. The walled garden at Calke Abbey has a section
originally built like that, but later work has raised it and
those courses are tapered in to be (nearer) horizontal.

Chris

I was thinking more of waving up and down rather than like you describe....