Thanks very much guys. This is the entrance to Sydney harbour, with the main, south arm of the harbour on the right and the Pacific ocean on the left. You can see the city east skyline on the right in the distance but the harbour bridge and CBD skyline are just out of the picture. Bondi beach is around that headland on the left.

I confess to liking horizons. Horizons define right angles to the line of sight and to gravity, and imply the possibility of travel to distant places. Placement and tilt of horizons affect perception and interpretation. Here, it seemed natural to have the horizon equally divide heaven and earth.

It's interesting to consider that not all humans experience one - rainforest tribes, for example. I sometimes wonder how that affects their thinking, their view of the world.