Yup, it's intriguing. For some reason, the first thought that entered my head was: The set of a Dr Who Interplanetary Walkabout. Not only do the gradients seem to pull all together, you half expect a Cyberman to waddle on, complain about his tired lallies, then become seriously menacing to maggoty earthlings...
Great sqaure composition, the sky even seems to draw itself to the centre where the sides of the mounds meet. I think this would look completely different and yet just as good on a blue skied day. Well composed! 7.