Hi to all.
I've already looked for that in the forum, but it seems that this question was never asked.
I've noticed that, on top of Sybil's office door, in the inside, there's a reversed "1313" writing. It looks like something (a sign?) that can be seen by outside, but it isn't.
I've first noticed that in S2 episodes. I should check whether it is true also of S1.
Has this number got a special meaning?