The supreme court entered its most active period with the arrival of chief justice

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Blank = Warren.

The Supreme Court entered its most active period with the arrival of cheif justice Warren.

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The answer would be the Gestalt Principle of Similarity. This states that things which have the same visual characteristics like shape, size, color, texture, value or orientation will be seen as belonging together. So for the case of Blake, when he saw the group of people wearing the green jackets, this shows that principle of similarity.