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  2. Penrose stairs - Wikipedia

    en.wikipedia.org/wiki/Penrose_stairs

    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.

  3. Stairs - Wikipedia

    en.wikipedia.org/wiki/Stairs

    A "quarter-turn" stair deposits the person facing 90° from the starting orientation. Likewise, there are half-turn, three-quarters-turn and full-turn stairs. A continuous helix may make many turns depending on the height. Very tall multi-turn helical staircases are usually found in old stone towers within fortifications, churches, and in ...

  4. Dog-leg (stairs) - Wikipedia

    en.wikipedia.org/wiki/Dog-leg_(stairs)

    A dog-leg staircase A quarter-landing, on a dog-leg staircase, is made into an architectural feature, by the use of arches, vaulting and stained glass. A dog-leg is a configuration of stairs between two floors of a building, often a domestic building, in which a flight of stairs ascends to a quarter-landing before turning at a right angle and continuing upwards. [1]

  5. Escalator - Wikipedia

    en.wikipedia.org/wiki/Escalator

    Similarly, the root word "scala" does not mean "a flight of steps", but is the singular form of the plural noun "scalae", which can denote any of: "a flight of steps or stairs, a staircase; a ladder, [or] a scaling-ladder." [21] The alleged intended capitalization of "escalator" is likewise a topic of debate. Seeberger's trademark application ...

  6. Jacob's Ladder (Saint Helena) - Wikipedia

    en.wikipedia.org/wiki/Jacob's_Ladder_(Saint_Helena)

    The staircase has been declared a Grade I listed structure. [4] During the island's annual "Festival of Running", a timed run takes place up Jacob's Ladder, with people coming from around the world to take part. As of 2016, the record time to ascend the stairs is 5 minutes, 16.78 seconds. [1]

  7. Isometric projection - Wikipedia

    en.wikipedia.org/wiki/Isometric_projection

    The Penrose stairs depicts a staircase which seems to ascend (anticlockwise) or descend (clockwise) yet forms a continuous loop. As with all types of parallel projection , objects drawn with isometric projection do not appear larger or smaller as they extend closer to or away from the viewer.

  8. Mystery Mine - Wikipedia

    en.wikipedia.org/wiki/Mystery_Mine

    After the modifications, the ride now makes a 90 degree left turn before its first large drop, which leads directly into a 180-degree right turn into the second block brake." [7] This new first drop has a trim brake and the former U-turn still remains unused. The rest of the layout remains the same, including the second half of the first ...

  9. List of ancient spiral stairs - Wikipedia

    en.wikipedia.org/wiki/List_of_ancient_spiral_stairs

    The spiral stair is a type of stairway which, due to its complex helical structure, has been introduced relatively late into architecture. Although the oldest example dates back to the 5th century BC, [ 1 ] it was only in the wake of the influential design of the Trajan's Column that this space-saving new type permanently caught hold in ancient ...