Saint John at Sounio and Ursa Major. The bright round object is a ball of light! Light painting is achieved by drawing shapes on the air with a source of light during  a relatively long exposure.
Canon EOS 550D, 18/5/2011 4:04, Shutter Speed 30, Aperture Value 7.1, Lens Canon EF15mm f/2.8 Fisheye, Focal Length 15.0 mm, ISO 400