"phi phenomenon" meaning in English

{
  "forms": [
    {
      "form": "phi phenomena",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "phi phenomena"
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      "expansion": "phi phenomenon (plural phi phenomena)",
      "name": "en-noun"
    }
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  "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"
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          "source": "w"
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          "source": "w"
        },
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          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Optical illusions",
          "orig": "en:Optical illusions",
          "parents": [
            "Vision",
            "Senses",
            "Perception",
            "Body",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The optical illusion whereby viewing a series of still images in rapid succession gives the impression of continuous motion."
      ],
      "id": "en-phi_phenomenon-en-noun-~wPgKgqZ",
      "links": [
        [
          "optical illusion",
          "optical illusion"
        ],
        [
          "series",
          "series"
        ],
        [
          "still",
          "still"
        ],
        [
          "image",
          "image"
        ],
        [
          "rapid",
          "rapid"
        ],
        [
          "succession",
          "succession"
        ],
        [
          "continuous",
          "continuous"
        ],
        [
          "motion",
          "motion"
        ]
      ],
      "wikipedia": [
        "phi phenomenon"
      ]
    }
  ],
  "word": "phi phenomenon"
}

{
  "forms": [
    {
      "form": "phi phenomena",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "phi phenomena"
      },
      "expansion": "phi phenomenon (plural phi phenomena)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
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        "Pages with entries",
        "en:Optical illusions"
      ],
      "glosses": [
        "The optical illusion whereby viewing a series of still images in rapid succession gives the impression of continuous motion."
      ],
      "links": [
        [
          "optical illusion",
          "optical illusion"
        ],
        [
          "series",
          "series"
        ],
        [
          "still",
          "still"
        ],
        [
          "image",
          "image"
        ],
        [
          "rapid",
          "rapid"
        ],
        [
          "succession",
          "succession"
        ],
        [
          "continuous",
          "continuous"
        ],
        [
          "motion",
          "motion"
        ]
      ],
      "wikipedia": [
        "phi phenomenon"
      ]
    }
  ],
  "word": "phi phenomenon"
}