"Penrose steps" meaning in English

{
  "etymology_text": "After a drawing by Lionel Penrose and Roger Penrose.",
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "Penrose steps pl (plural only)",
      "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 entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "English pluralia tantum",
          "parents": [
            "Pluralia tantum",
            "Nouns",
            "Lemmas"
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          "source": "w"
        },
        {
          "kind": "other",
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          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Artistic works",
          "orig": "en:Artistic works",
          "parents": [
            "Art",
            "Culture",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2010 July 8, Inception (Movie), spoken by Arthur (Joseph Gordon-Levitt)",
          "text": "In a dream, you can cheat architecture into impossible shapes. That lets you create closed loops, like the Penrose Steps. The infinite staircase.",
          "type": "quotation"
        },
        {
          "ref": "2011 May 13, Amal A. Islim, Walking with the Vain Cattle: In the Womb of Life, the Plant of Miracle Is Ready to Blossom a White Flower, Bloomington: Balboa Press, →OL",
          "text": "I'll have my heaven, / Where heaven is love and love is my heaven. / I just have to climb through those Penrose steps! / Till I find sky number seven.",
          "type": "quotation"
        },
        {
          "ref": "2012 April 16, Rob Coley with Dean Lockwood, Cloud Time, Alresford: Zero Books, →OL, page 100",
          "text": "At this book's inception, when we came to, we found ourselves already traipsing around Penrose steps, already reactively enclosed in an unceasing loop.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An impossible loop of endlessly ascending and descending stairs, or an optical illusion appearing to be one."
      ],
      "id": "en-Penrose_steps-en-noun-F1txWXSc",
      "links": [
        [
          "impossible",
          "impossible"
        ],
        [
          "loop",
          "loop"
        ],
        [
          "endlessly",
          "endlessly"
        ],
        [
          "ascend",
          "ascend"
        ],
        [
          "descend",
          "descend"
        ],
        [
          "stairs",
          "stairs"
        ],
        [
          "optical illusion",
          "optical illusion"
        ]
      ],
      "synonyms": [
        {
          "word": "Penrose staircase"
        },
        {
          "word": "Penrose stairs"
        }
      ],
      "tags": [
        "plural",
        "plural-only"
      ],
      "wikipedia": [
        "Lionel Penrose",
        "Roger Penrose"
      ]
    }
  ],
  "word": "Penrose steps"
}

{
  "etymology_text": "After a drawing by Lionel Penrose and Roger Penrose.",
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "Penrose steps pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English entries with topic categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English pluralia tantum",
        "English terms with non-redundant non-automated sortkeys",
        "English terms with quotations",
        "en:Artistic works"
      ],
      "examples": [
        {
          "ref": "2010 July 8, Inception (Movie), spoken by Arthur (Joseph Gordon-Levitt)",
          "text": "In a dream, you can cheat architecture into impossible shapes. That lets you create closed loops, like the Penrose Steps. The infinite staircase.",
          "type": "quotation"
        },
        {
          "ref": "2011 May 13, Amal A. Islim, Walking with the Vain Cattle: In the Womb of Life, the Plant of Miracle Is Ready to Blossom a White Flower, Bloomington: Balboa Press, →OL",
          "text": "I'll have my heaven, / Where heaven is love and love is my heaven. / I just have to climb through those Penrose steps! / Till I find sky number seven.",
          "type": "quotation"
        },
        {
          "ref": "2012 April 16, Rob Coley with Dean Lockwood, Cloud Time, Alresford: Zero Books, →OL, page 100",
          "text": "At this book's inception, when we came to, we found ourselves already traipsing around Penrose steps, already reactively enclosed in an unceasing loop.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An impossible loop of endlessly ascending and descending stairs, or an optical illusion appearing to be one."
      ],
      "links": [
        [
          "impossible",
          "impossible"
        ],
        [
          "loop",
          "loop"
        ],
        [
          "endlessly",
          "endlessly"
        ],
        [
          "ascend",
          "ascend"
        ],
        [
          "descend",
          "descend"
        ],
        [
          "stairs",
          "stairs"
        ],
        [
          "optical illusion",
          "optical illusion"
        ]
      ],
      "tags": [
        "plural",
        "plural-only"
      ],
      "wikipedia": [
        "Lionel Penrose",
        "Roger Penrose"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Penrose staircase"
    },
    {
      "word": "Penrose stairs"
    }
  ],
  "word": "Penrose steps"
}