The First Hire

The bridge is the moon. The white disc sits behind the gap and its middle makes the only flat line across it, so what they are standing on is light and nothing else. There is nothing underneath. Below the line the rest of the circle carries on down into the dark.

Two colours do all the work — the blue of the night and the brown of the rock. The single warm patch is the yellow behind the four figures holding hands. The man walking in from the right is alone, in full black, and carrying a bag.