I saw logic and emotion in this film. People who are not "ill" represent pure reason, and those who are "ill" symbolize strong emotions and senses.
In the former world, the rainbow is a neutral gray, hard and smooth. In the latter world, rainbows are colorful, beautiful, and fleeting.
No emotion, no rich sense of touch, taste, smell, sight, hearing. Facing the beautiful scenery does not feel pleasing and refreshing; eating a piece of bitter chocolate does not experience the faint fruity or hazelnut aroma;
Maybe the progress of this world only needs logic, but people need emotion.
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