"Wizard of Oz experiment" meaning in English

{
  "etymology_text": "Referring to a scene in which the Wizard of Oz hides behind a curtain to project an intimidating shadow image.",
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  "lang_code": "en",
  "pos": "noun",
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          "name": "The Wizard of Oz",
          "orig": "en:The Wizard of Oz",
          "parents": [
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            "Literature",
            "Fiction",
            "United States",
            "Culture",
            "Entertainment",
            "Writing",
            "Artistic works",
            "North America",
            "Society",
            "Human behaviour",
            "Language",
            "Art",
            "America",
            "All topics",
            "Human",
            "Communication",
            "Earth",
            "Fundamental",
            "Nature"
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      "glosses": [
        "In the field of human-computer interaction, a research experiment in which subjects interact with a computer system that they believe to be autonomous, but which is actually being operated by an unseen human being."
      ],
      "id": "en-Wizard_of_Oz_experiment-en-noun-OQoWuftF",
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          "human-computer interaction",
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          "experiment",
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          "system"
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          "autonomous"
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          "unseen"
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      ],
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        "Wizard of Oz experiment"
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}