Undoubtedly the following fact is surprising when being first encountered with: It possible to cut a hole in unit cube such that another can pass through it.

We present an extension to the model-free anomaly detection algorithm, Isolation Forest. This extension, named Extended Forest (EIF), resolves issues with assignment of score given data points. motivate problem using heat maps for scores. These suffer from artifacts generated by criteria branching operation binary tree. explain this in detail and demonstrate mechanism which it occurs visually. ...