In the anime Elfen Lied, Kouta and Yuuka own a grandfather clock that, if I recall correctly, has been broken for quite some time prior to the start of the series. At the very end of the final episode, Kouta and Yuuka sit down (with Nana and Mayu, I believe) to start their new life... only for the grandfather clock to mysteriously start chiming, apropos of nothing, just as
a figure implied to be Lucy approaches the front door.
I never understood what the deal was with the grandfather clock, and why it suddenly began working again at the end. I'm guessing that it must be symbolic of something, but I can't think what it might be symbolizing. If it's meant to symbolize Kouta moving on with his life, then
Lucy apparently showing up again rather ruins that.
What is the significance of the grandfather clock in Elfen Lied?