Babel represents director Alejando Gonzalez Iñárritu's conclusion to a stylistic and thematic trilogy begun in Amores Perros and continued in 21 Grams. Of the three, Babel is arguably the most accessible. As with 21 Grams (and to a lesser degree Amores Perros), this movie is constructed as a puzzle, with different pieces transpiring during different times and in different places over a five-day span. However, this one is less complicated to put together. (Think of it as the difference between assembling a 250-piece jigsaw and a 50-piece one.) The temporaral discontinuities are not extreme, and there is clear background evidence of how each sequence relates to those around it and fits into the global time-line. This allows story to take precedence over structure.
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