A3. Wich is the main theme?

These photos, from A1 to A6, are a selection of photographs that were

taken to represent the same idea... I would like to know your

opinion, and I would really appreciate if you tell me the "idea"

or "theme" that cames up to your minds when you see these six

photographs (A1,A2,A3,A4,A5,A6), thanksfully from Argentina...