So on a local buy and sell list, someone posted this picture of a planter that they were looking for someone to build:
Then a side discussion ensued-one guy argued that building it with mortar would make it stronger.
I argued that it would actually be weaker in the long run to build it with mortar, because of the internal pressure (gravity) and freeze/thaw cycles of the moisture in the dirt, and lack of support.
I also said it would be stronger with criss crossing internal rods with 90 degree ends buried in the mortar, and noted that using random stones as shown would use a lot of mortar, while using shaped stones would be stronger, but still be subject to failure in a couple of years, at least in the form of cracks, to start.
I even put forth that the original design, with the welded wire shell, would last longer, except for the possibility of the wire rusting if only using paint. Plenty of room for expansion of moisture during freeze/thaw, and even room for the dirt to kinda "squeeze" through, instead of either one pushing against a solid wall.
I also pointed out that the sharp corners of the walls where the spiral drops down would be the weakest points without support, they'd be better off making the spiral smooth, even if they had to cut the stones at angles.
What does the hive engineering mind say?