Printed from: https://conservationhandbooks.com/dry-stone-walling/dry-stone-features/holes-and-apertures/
Raised holes in walls occur in a variety of shapes and sizes, and for various purposes. Simple square and rectangular vertical slits are built in the same way as smoots. Round, triangular and cross-shaped holes are normally for decorative purposes. Round Round holes are also known as bull’s eyes, and basically consist of two semi-circular...