"Delboeuf illusion" meaning in All languages combined

{
  "etymology_text": "Discovered in 1865 by the Belgian scientist Joseph Remi Leopold Delboeuf (1831–1896).",
  "forms": [
    {
      "form": "Delboeuf illusions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Delboeuf illusion (plural Delboeuf illusions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Optical illusions",
          "orig": "en:Optical illusions",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "An optical illusion of relative size perception, usually illustrated by two discs of identical size, one of which is surrounded by a ring."
      ],
      "id": "en-Delboeuf_illusion-en-noun-owewYeTk",
      "links": [
        [
          "optical illusion",
          "optical illusion"
        ],
        [
          "relative",
          "relative"
        ],
        [
          "size",
          "size"
        ],
        [
          "perception",
          "perception"
        ],
        [
          "ring",
          "ring"
        ]
      ]
    }
  ],
  "word": "Delboeuf illusion"
}

{
  "etymology_text": "Discovered in 1865 by the Belgian scientist Joseph Remi Leopold Delboeuf (1831–1896).",
  "forms": [
    {
      "form": "Delboeuf illusions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Delboeuf illusion (plural Delboeuf illusions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Optical illusions"
      ],
      "glosses": [
        "An optical illusion of relative size perception, usually illustrated by two discs of identical size, one of which is surrounded by a ring."
      ],
      "links": [
        [
          "optical illusion",
          "optical illusion"
        ],
        [
          "relative",
          "relative"
        ],
        [
          "size",
          "size"
        ],
        [
          "perception",
          "perception"
        ],
        [
          "ring",
          "ring"
        ]
      ]
    }
  ],
  "word": "Delboeuf illusion"
}