Based on the given description, it can be noted that Darryl is demonstrating a lack of difference between himself and his environment.
This refers to the inherent ability and attitudes of a person that guides how he responds to issues.
Hence, we can see that given description of their emotions of Darryl as he thinks that playing peek-a-boo is hilarious and after he gets worried for his mom, sees her, and becomes excited, he is demonstrating a lack of difference between himself and his environment.
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