KerBabel — the back room : the (partly hidden) dimension of conception, design, realisation & reflexion that animates and underpins the ePLANETe on-line system.  The specificity of ePLANETe resides in its spectrum of sustainability-related catalogues, its participatory deliberative philosophy, the user-friendly character of the procedures for creating objects within each gallery and, the ‘cross-linking’ from one object to another that, in cumulative effect, transforms the entire system into a novel sort of participatory and reflexive social networking.