This has actually--like many Japanese pratices, been cultivated (haha ... forgive the pun) to a "fine science." I remember seeing an excellent, illustrated article on the basic principles and elements that are applied by the Japanese in a Japanese garden, in an encyclopedia Brittannica, of all places. I remember it describing various elements that mimicked natural elements: mountains and hills, lakes, rivers, forests and plains--that were incorporated into the garden via landscaping--mounds, ponds, moss and groundcover, and stones of widely varying sizes. The illustration alone conveyed the general idea very well.
Unfortunately the article was not online, so I cannot provide a link. When I have some more time I will do a search of my Japaneezy online resources and see if I can find anything on the subject. It's something that I've been meaning to do for some time anyway.
Good luck with your garden.
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