What is this interesting pattern below ? A psychedelic painting? The Lord Chancellor's latest wallpaper? No, it is a Ground Penetrating Radar (GPR) scan of the alleged mass grave site at Treblinka, Poland, conducted to a depth of eighteen feet by an expert in November 1999: it seems the ground has remained undisturbed for millions of years. Clever old Nazis, to have put every stone back in place where it was -- and in the panic of defeat.