The first 30 minutes of the movie I was basically in a state of chaos, three seemingly unrelated events unfolded in parallel, especially when the ruffian uncle Jack appeared. He was an ardent Christian who always wanted to dominate others by his own will. Although his heart was full of repentance, it seemed that God had given him no chance of atonement, which deepened his remorse indefinitely.
Paul, played by Sean Penn, is in this state for most of us in our lives: we have neither lost nor gained, we shuttle in other people's lives, and often do not know who we are. Paul felt he had to find Kristina, he looked for her, and saw her unintentionally. When she buys wine, when she swims, and when she eats. Paul told her that eating alone was bad for her kidneys, and she just coldly refused. Maybe it's because that heart guides Paul to continue to accompany Kristina. No matter who's in the body, this heart will always love her.
Kristina can't get out of the past, she suffers from loss; Paul gets her dead husband's heart, but he doesn't really get anything, but is even more dazed because he forgets the past; Jack is the culprit who took away K's family, or as the movie metaphors In that way, he was a thief who stole K's family. Regrets but useless, sins are as indelible as his tattoos. Some people live in the past, some people forget the past, and some people can't get rid of the past.
The law of conservation of energy says that energy doesn't disappear, it just changes from one form to another. This film can also be simply understood as Jack stole K's husband's heart and gave it to Paul. The seemingly perfect and balanced process did not strictly abide by the law of conservation of energy, and lost 21 grams out of thin air. That's the lost energy, the weight of the soul.
How much did you gain? How much did you lose? 21grams.
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