21.   In the daytime, despite subtle shifts caused by pollution and worldwide weather patterns, the diffuse northern sunlight has remained fairly constant over the centuries.

22.   It is not so much the yardage gained on the play, but the subtle shift that comes with it.

23.   McGwire himself saw a subtle shift toward appreciating the modern game during his chase.

24.   On first listen, some of the songs have unusual structures with subtle shifts in mood and tempo.

25.   One reason cited for this sudden confluence of style mavens is a subtle shift in demographics.

26.   Quakefinder detected extremely subtle shifts in the ground surface caused by the quake.

27.   Scullers also use subtle shifts of the hands to turn the blades parallel and perpendicular to the water at different points in the stroke.

28.   Some of the poor performances of many funds may also have their roots in a subtle shift in the goals of the fund companies.

29.   Still, the discussions about the law have underscored some subtle shifts in the societal response to domestic violence.

30.   Steering is done through subtle shifts of body weight.