Lighthouse is inspired by Covey's lighthouse anecdote in his book, The 7 Habits of Highly Effective People. He narrated the imminent clash of a battleship against a light coming from a distance.
The battleship kept asking the light to move thinking it was another ship until it learned that it was a lighthouse and therefore cannot be altered.
Lighthouse represents principles or natural laws; we cannot break them, we can only break ourselves against them.