An immune inspired model that can detect anomalies, even when trained only with normal samples, and can learn from encounters with new anomalies is presented. The model combines a negative selection algorithm and a self-organizing map (SOM) in an immune inspired architecture. The proposed system is able to produce a visual representation of the self/non-self feature space, thanks to the topological 2-dimensional map produced by the SOM. Some experiments were performed on classification data; the results are presented and discussed.