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  2. Penrose triangle - Wikipedia

    en.wikipedia.org/wiki/Penrose_triangle

    A 3D-printed version of the Reutersvärd Triangle illusion. M.C. Escher's lithograph Waterfall (1961) depicts a watercourse that flows in a zigzag along the long sides of two elongated Penrose triangles, so that it ends up two stories higher than it began. The resulting waterfall, forming the short sides of both triangles, drives a water wheel.

  3. Penrose tiling - Wikipedia

    en.wikipedia.org/wiki/Penrose_tiling

    Penrose originally discovered the P1 tiling in this way, by decomposing a pentagon into six smaller pentagons (one half of a net of a dodecahedron) and five half-diamonds; he then observed that when he repeated this process the gaps between pentagons could all be filled by stars, diamonds, boats and other pentagons. [28]

  4. Illumination problem - Wikipedia

    en.wikipedia.org/wiki/Illumination_problem

    Solutions to the illumination problem by George W. Tokarsky (26 sides) and David Castro (24 sides) This problem was also solved for polygonal rooms by George Tokarsky in 1995 for 2 and 3 dimensions, which showed that there exists an unilluminable polygonal 26-sided room with a "dark spot" which is not illuminated from another point in the room ...

  5. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    The Penrose stairs were created by Lionel Penrose and his son Roger Penrose. [3] A variation on the Penrose triangle , it is a two-dimensional depiction of a staircase in which the stairs make four 90-degree turns as they ascend or descend yet form a continuous loop, so that a person could climb them forever and never get any higher.

  6. Roger Penrose - Wikipedia

    en.wikipedia.org/wiki/Roger_Penrose

    In 2020, Penrose was awarded one half of the Nobel Prize in Physics by the Royal Swedish Academy of Sciences for the discovery that black hole formation is a robust prediction of the general theory of relativity, a half-share also going to Reinhard Genzel and Andrea Ghez for the discovery of a supermassive compact object at the centre of our ...

  7. Today’s NYT ‘Strands’ Hints, Spangram and Answers for ...

    www.aol.com/today-nyt-strands-hints-spangram...

    In today's puzzle, there are seven theme words to find (including the spangram). Hint: The first one can be found in the top-half of the board. Here are the first two letters for each word: PL. CR ...

  8. Penrose stairs - Wikipedia

    en.wikipedia.org/wiki/Penrose_stairs

    However, in the case of the Penrose stairs the hero descends another flight of stairs to catch up to the antagonist and catch him unaware. [14] The cover of the 2011 album Angles by American rock band The Strokes depicts a complex set of Penrose stairs. In their 2015 single called "Greek Tragedy," English rock band The Wombats mentions the ...

  9. Today’s NYT ‘Strands’ Hints, Spangram and Answers for Friday ...

    www.aol.com/today-nyt-strands-hints-spangram...

    In today's puzzle, there are six theme words to find (including the spangram). Hint: The first one can be found in the top half of the board. Here are the first two letters for each word: SE. TA ...