The world is full of lines. I noticed several in the above picture. There are the four broad lines, of course: grass, sand, sea and sky. But notice the white rocky edge at the end of the lawn, and the wet patch of sand at the end of the beach, and the breaking surf where the sea begins, and the line between the shallow and the deep ocean, and the thin white horizon, and what looks like three layers of sky… Sometimes, lines are there, whether you draw them or not.