Symposium of the Group of J. P. Toennies, held at Hardehausen, Germany, 1996 Max-Planck-Institute for Fluid Dynamics, Department of Molecular Interactions, Göttingen, Germany (nowadays Max-Planck-Institute for Dynamics and Self-Organization) On the staircase, from the left: 1 Michal Farnik; 2 Wieland Schöllkopf; 3 Peter Day; 4 Rainer Bachmann; 5 Matthias Schinacher; 6 Andrew Graham; 7 Christian Johann; 8 Udo Tappe; 9 Sven Schaper; 10 Christian Görling; 11 Björn Samelin; 12 Daniel Nowak; 13 Peter Hahn; 14 John Close; 15 Rolf Gerlach; 16 Peter Fouquet; 17 Jan Harms; 18 Matthias Hartmann; 19 Dirk Fuhrmann; 20 Christof Ottinger; 21 Horst-Günther Rubahn; 22 Andreas Nolte; 23 Wolfgang Sattler; 24 Lev Y. Rusin; 25 Vyacheslav Akimov In front of the staircase, from the left: 26 Norbert Quaas; 27 Nasser Mustafa; 28 Mustafa Ayabakan; 29 Andreas Bartelt; 30 Alexei Glebov; 31 Andreas Ehbrecht; 32 Klaus v. Haeften; 33 Stefan Vollmer; 34 Albrecht Lindinger; 35 Andrej Vilesov; 36 Jens Braun; 37 Guido Brusdeylins; 38 Werner Steinhögl; 39 Walter Silvestri; 40 Thorsten Winkler; 41 Volkmar Senz; 42 Jan Peter Toennies