Here's a question, partly related to my thoughts about using string to define a circle.
In the case of building the circular structure shown in this photo (which I've been documenting for the last week or so) is anything improved structurally by actually having a 'defined' outside cylindrical surface,with stone material separately back-filled after?
Example B
Or, might it be just as structural, or perhaps better, to 'morph' the outer stonework into the same back-fill material (leaving the outside shaggy) so that, in effect, it has no outside dimensions at all? Example A
