Shadows: Curving Rail

Notes:		This is such an obvious study of shadows and forms that it feels a bit cliché to me, as if I should be submitting this in an intro to photography class.
Location:		South Street Bridge, Philadelphia, PA
Camera:		Canon EOS 350D Digital Rebel XT, Sigma 55-200mm f/4-5.6
EXIF:		Aperture Priority, Pattern Metering, EV +1/3, 1/160 sec, F/8, ISO-100, 78 mm (125 mm equivalent)