At the hockey game, Marcos could easily spot who was cheering for the other team. They were seated throughout the arena, but each of them was wearing the team colors of red and gray. Marcos was relying on the grouping principle of

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Marcos was using the principle of similarity, which states that people tend to group together elements that are similar in appearance, such as the team colors of red and gray.

At the Hockey Game, Marcos Could Easily Spot Who Was