Printed from: https://conservationhandbooks.com/dry-stone-walling/dry-stone-features/pillars/
Square, or less commonly rectangular pillars tend to be built in areas, such as those of sandstone, where there are plenty of square stones, called quoins, for making the corners. Round pillars require lots of small stone, or stone which can be shaped easily. Even given good stone, both types require time and patience to...