Ergo proxy is a really amazing anime in my opinion. It may not have many action sequences but the plot is excellent. The main reason why Ergo Proxy is not popular is because its a really complex anime with lots of psychological references. read more
Daedalus tells Re-l in re-l124C41+ that the Proxies can best be thought of as a dome's "life force", and the collapse of Romdo after Monad is killed and Vincent (Ergo Proxy) leaves demonstrates that the presence of a Proxy is required to maintain the cities life support. read more