It is proving to be a good year for holly berries, clustered together in an arresting scarlet show among the shiny green leaves.

These grow in a supersaturated environment, before clustering together and falling to the ground.

In the autumn its small but perfectly formed bright red rounded hips are clustered together and persist well into the winter if the birds don't munch them.

You can see how the relatives cluster together.

Roads devoted to the great poets cluster together all over the country.