Because he mistakenly thinks that blown-up balloons are always round, his idea best illustrates a schema.
This refers to the pattern of thought which helps to organizes categories of information and the relationships among them.
Hence, the information of the blown-up balloons have not been captured by his thought in order to be differentiated from the pumped balloons.
Hence, as he mistakenly thinks that blown-up balloons are always round, his idea best illustrates a schema.
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