I think it was the shadows made by the trees that fascinated me, Poirot.

>>I was sort of hoping for something more in the Impressionist line - a little more Pissarro - or Monet.<<

The source of the light that caused those shadows was, using a quick bit of high school geometry on the angles they cast on the ground, somewhere around a mile away. So that thing in the background that looked vaguely like the sun would be sitting on top of the Sydney Cricket Ground (morning light) or somewhere on the Sydney Uni campus (evening).

I'd go for surrealist, myself.