Tessellation Reconstruction Techniques
  The application of Voronoi and Delaunay tessellation based methods for reconstructing continuous fields from discretely sampled data sets is discussed. The succesfull operation as ``multidimensional interpolation'' method is corroborated through their ability to reproduce even intricate statistical aspects of the analytical predictions of perturbation theory of cosmic velocity field evolution. The newly developed and fully self-adaptive technique for density field estimation by means of Delaunay tessellations, basically exploiting their ``minimum triangulation'' quality, is shown to succesfully reproduce the morphology of the foamlike structure in N-body simulations of cosmic structure formation. The full hierarchy of structure is implicitly and directly reproduced at every spatial resolution scale present in the particle distribution, at the same time automatically and sharply rendering its characteristic anisotropic filamentary and wall-like features. 
Rien van de Weygaert and Willem Schaap (Kapteyn Institute, University   of Groningen, the Netherlands)