To and fro

Where the wave of moonlight glosses
The dim grey sands with light,
Far off by furthest Rosses
We foot it all the night,
Weaving olden dances,
Mingling hands and mingling glances
Till the moon has taken flight;
To and fro we leap
And chase the frothy bubbles,
While the world is full of troubles
And is anxious in its sleep. (WB Yeats)