I know that it's unlikely that many people will ever see this, but it's been bugging me for a while now.
In the episode, The Girl in the Fireplace of Doctor Who, The Doctor realizes that there is a Clockwork Robot in Reinette's room because the clock is broken, but he can still hear ticking.
However, to get into the room, the Doctor spins the entire Mantelpiece around. Thus, the intact clock we see when he first approaches the fireplace should now be facing into the room.

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