Barring the one on the far left, they're roughly the locations of original concrete and brick dividers in a garden bed i've been painstakingly prying out out and cleaning up over the past year (salvagable concrete chunks will become crazy paving, bricks a pathway). His Lordship liked the dividers, but they had to come out, they were falling apart, cracking and subsiding, plus i wanted to put in raised and wicking beds (getting old and i already broke my back).

It also has a retaining wall around it, but no outlet for water (and at the bottom of a slope), so it bogs a bit...my solution was getting a hole punched in the side, dig agi in along the divider lines and when i backfill i'm gonna echo the original dividers by having channels of river pebbles famed by aluminium edging along the lines.