which will it blow down?

The pebby beach on Lindisfarne, aka Holy Island, in Northumberland is strewn with cairns. They seem to have no purpose as far as I could make out except to satisfy the architectural gene in tourists.

The pebble designs have also claimed the adjacent dry walls.

The actual dry walls though, are sturdy surviving decades, possibly centuries.

But compared to Lindisfarne Castle they all look rather shaky.

Cee’s Fun Foto Challenge: Sturdy or Shaky