Curves

1/500 sec @ f5.6, 5.8mm, Canon A710
The graceful arch of a doorway frames the view beyond quite well I think.

1/250 sec@ f8, ISO100, 17mm (zoom), Canon 20D

Not for nothing are the curves of the de la Warr pavillion, Bexhill included here. It seems modern architecture is rich with curves.

3.2 secs @ f32, ISO100, 73mm (zoom), Canon 20D

Curves from light. Quite a sense of motion here.

1/320 sec @ f11, ISO400, 64mm (zoom), Canon 20D

Top of a building in Barcelona.