"Ponzo illusion" meaning in English

{
  "etymology_text": "First demonstrated by the Italian psychologist Mario Ponzo (1882–1960) in 1911.",
  "forms": [
    {
      "form": "Ponzo illusions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Ponzo illusion (plural Ponzo illusions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
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          "source": "w"
        },
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          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
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          "source": "w"
        }
      ],
      "glosses": [
        "An optical illusion whereby a horizontal bar looks wider when farther up a picture of railroad tracks than when lower."
      ],
      "id": "en-Ponzo_illusion-en-noun-9swwlMSn",
      "links": [
        [
          "optical illusion",
          "optical illusion"
        ],
        [
          "horizontal",
          "horizontal"
        ],
        [
          "bar",
          "bar"
        ],
        [
          "wide",
          "wide"
        ],
        [
          "railroad track",
          "railroad track"
        ]
      ],
      "wikipedia": [
        "Ponzo illusion"
      ]
    }
  ],
  "word": "Ponzo illusion"
}

{
  "etymology_text": "First demonstrated by the Italian psychologist Mario Ponzo (1882–1960) in 1911.",
  "forms": [
    {
      "form": "Ponzo illusions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Ponzo illusion (plural Ponzo illusions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys"
      ],
      "glosses": [
        "An optical illusion whereby a horizontal bar looks wider when farther up a picture of railroad tracks than when lower."
      ],
      "links": [
        [
          "optical illusion",
          "optical illusion"
        ],
        [
          "horizontal",
          "horizontal"
        ],
        [
          "bar",
          "bar"
        ],
        [
          "wide",
          "wide"
        ],
        [
          "railroad track",
          "railroad track"
        ]
      ],
      "wikipedia": [
        "Ponzo illusion"
      ]
    }
  ],
  "word": "Ponzo illusion"
}