So what is a Crown Green? It is not weathered copper headwear but it is an area of grass with a convex centre. The nature of the ground means that there is probably not just one centre on a crown green but an uneven area with many different rises, dips and slopes. The photo below demonstrates the highest part of the Vardre Deganwy Crown Green, ably modelled by Wendy.
Vardre Deganwy Crown Green Bowling Club 