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The constructivist view , held by such philosophers as Ernst von Glasersfeld , regards the continual adjustment of perception and action to the external input as precisely what constitutes the " entity , " which is therefore far from being invariant .
 Ernst von Glasersfeld
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ernst von Glasersfeld