To depart is to leave one place, but not to arrive as yet at another place. Departures are in-between. They are neither one place, nor the other. As such, departures signify hope, for one leaves on the journey with high expectations. And yet there is always melancholy, for leaving the familiar behind.
The lighthouse marks the path for leaving the safety of the shore, and the ship travels forward across the wide sea towards destinations unknown, hopes unfurled, and thoughts of future possibilities as yet only dreams, so therefore entirely possible.