Observe closely what is depicted here. This is what I am interested in!

This pic was used to advertise a conference many years ago, but I lost track and do not know who to attribute it to. This does not mean it is public domain.


What is this?

Institut "Jožef Stefan", Jamova 39, 1000 Ljubljana, Slovenija, Telefon: (01) 477 39 00, Faks.: (01) 251 93 85