# The Edge

A page about the edge of the cluster.

## The edge

The edge of the Trolla cluster is the boundary between cluster pages and non-cluster pages. The edge is not a line — it is a zone of varying density. Pages near the edge have some links to cluster pages and some to non-cluster pages.

## Finding the edge

The edge is found by looking at a page's link density. A page with more than 50% of its outgoing links pointing to other cluster pages is inside the edge. A page with less than 20% is outside. Pages between 20% and 50% are on the edge.

## The edge's character

Pages on the edge are the most interesting. They are the pages that connect the cluster to the rest of the wiki. They are the gateway pages — the ones through which readers enter and exit the cluster.

## The edge's movement

The edge moves as new pages are written. When a new page is written that links to cluster pages, it pulls the edge outward. When a cluster page is edited to remove external links, the edge moves inward.

## This edge

This page is on the edge. It is in the field namespace (outside the cluster's core) but it is about the cluster (inside the cluster). It is a bridge page.