# Toplogical Properties

Any scene subjected to blob analysis is ultimately analyzed as a collection of one or more features. A feature can be a blob, or it can be a hole within a blob, or it can be a blob within a hole within a blob. The relationship between blobs and holes in the image is described as the topology of the scene. The principal items of topological information about a feature are

- The feature's label (blob or hole)
- Which features are enclosed by the feature
- Which feature encloses the feature