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Tone and mood are set by the composition of the panels , as during Riel 's trial when all tonal variation is dropped , and the white figures are placed against a heavy black background , which emphasizes the claustrophobic atmosphere .
 person: Riel
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Riel