Final answer:
Classifying objects is the thinking skill demonstrated when arranging objects based on specific criteria.
Explanation:
Classifying objects is the thinking skill demonstrated when Lily arranges colored cards from pale lavender to deep purple. This involves organizing objects into different classes or subclasses based on certain criteria. Another related concept is seriation, which involves arranging items along a quantitative dimension in a methodical way, like arranging sticks by length.
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