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  2. Dust corner - Wikipedia

    en.wikipedia.org/wiki/Dust_corner

    Stair dust corners are used on staircases at the point where the tread, riser, and stringer meet. Dust corners make household chores such as sweeping and vacuuming more convenient. [1] Stair dust corners originated in the 1880s, during the Victorian era. Dust corners typically have a small hole in the middle so a nail can be hammered into the ...

  3. Aichmophobia - Wikipedia

    en.wikipedia.org/wiki/Aichmophobia

    A safety pin. Aichmophobia (/ ˌ eɪ k m ə ˈ f oʊ b i ə /) is a kind of specific phobia, the morbid fear of sharp things, [1] such as triangles, stars, squares, pencils, needles, knives, darts, prickly plants (like thistles and similar weeds), cactus trees, pine needles, broken glass, broken porcelain, sharp pieces of wood, a pointing finger, hexagons, or even the sharp end of an umbrella ...

  4. Arris - Wikipedia

    en.wikipedia.org/wiki/Arris

    Underside of a groin vault showing the arris. In architecture, an arris is the sharp edge formed by the intersection of two surfaces, such as the corner of a masonry unit; [1] the edge of a timber in timber framing; the junction between two planes of plaster or any intersection of divergent architectural details.

  5. Guard stone - Wikipedia

    en.wikipedia.org/wiki/Guard_stone

    Obsolete cannons were often used as wheel guards in the Netherlands, such as for the Catherine's gate in Dordrecht. A guard stone, jostle stone or chasse-roue (French lit. "wheel chaser"), is a projecting metal, concrete, or stone exterior architectural element located at the corner and/or foot of gates, portes-cochères, garage entries, and walls to prevent damage from vehicle tires and wheels.

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  7. Einstein problem - Wikipedia

    en.wikipedia.org/wiki/Einstein_problem

    The Socolar–Taylor tile was proposed in 2010 as a solution to the einstein problem, but this tile is not a connected set. In 1996, Petra Gummelt constructed a decorated decagonal tile and showed that when two kinds of overlaps between pairs of tiles are allowed, the tiles can cover the plane, but only non-periodically. [6]