It has to be remembered that, on the one hand we study specified knowledge (or analysis results) related to a given dataset (here, birds' geographical positionfirst example-and oligonucleotide counts-second example-) and on the other hand, a taxonomy (the tree) of these data is available. In the present paper, we aim to display the taxonomy and the knowledge together. The procedure described in section 2 provides a taxonomic color-code used here to color geographic position of birds or genomic signatures.