I find holes in a forest canopy and with multiple exposures rotate the camera around. This first rectangular image was then flipped, copied and added to the original to make a square image that best shows the circular motion. The cockatoos were added later to add to the drama.
Tree and Sky image: Freycinet National Park, Tasmania
Nikon D300, Nikon18–200mm, 1/125, f/8.0, ISO 400, seven multiple exposures within camera, moving in a circle while pointing the camera skyward
Cockatoos image: Bayswater, Perth
Canon Powershot G11, 6–35mm, 1/80, f/4.0, ISO 80