In dynamic armouring smaller particles are used and they are allowed to adjust by erosion and deposition to the prevailing wave climate, while still protecting the finer particles behind them from being washed away. In static armouring very large stones are placed to lock the shore in place - no movement is anticipated even in the worst storm. What are the advantages and disadvantages in both human terms (use, appearance, cost) and natural terms of the two strategies for coastal protection?