What the pros are doing - Repetition

Not only the seats are  used as repetition but also what the screens are showing.
Doe-Eyed
Lisa Simpson appears on television screens on a new Singapore Airlines Airbus A380 after its inaugural passenger flight from Singapore to Sydney, Australia.

 The repetition of the soldiers in the background make the main subject in this photo stand out.
Granny's Got A Gun
A member of the National Revolutionary Militia shows off her rifle during Militia Day in Caracas, Venezuela.

Repetition is used here with the people and their attire. it makes you focus on every single person who is wearing the same thing.
Preparation
Penitents prepare their costumes before a procession during Holy Week in Bilbao, Spain.