I must say that Ghost Hound is the most complex and technical anime ever made. It's the kind of anime which make you go on the wiki and search for the terminology. As is expected from the staff of Serial Experiment Lain, you have to pay attention to detail or re-watch it to understand what the story is about and the relationship and explanation of it. Ghost Hound, whose idea has gone through 8 years of planning, is indeed a masterpiece. A must see for any hardcore sci-fi fan.