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  2. Hering illusion - Wikipedia

    en.wikipedia.org/wiki/Hering_illusion

    The Hering illusion is one of the geometrical-optical illusions and was discovered by the German physiologist Ewald Hering in 1861. [1] When two straight and parallel lines are presented in front of a radial background (like the spokes of a bicycle), the lines appear as if they were bowed outwards.

  3. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    Hering illusion: The Hering illusion (1861): When two straight and parallel lines are presented in front of radial background (like the spokes of a bicycle), the lines appear as if they were bowed outwards. Hollow-Face illusion: The Hollow-Face illusion is an optical illusion in which the perception of a concave mask of a face appears as a ...

  4. List of bicycle parts - Wikipedia

    en.wikipedia.org/wiki/List_of_bicycle_parts

    The seat post attaches to the seat rails by means of a clamp; Seat lug: a frame lug on the top of the seat tube serving as a point of attachment for a clamp to secure the seat post; Seat tube: the roughly vertical tube in a bicycle frame running from the seat to the bottom bracket; Seat bag: a small storage accessory hung from the back of a seat

  5. Hering's law of visual direction - Wikipedia

    en.wikipedia.org/wiki/Hering's_law_of_visual...

    Hering's window demonstration of his law of visual direction. Both eyes fixate a point on the window. The right eye sees Captain Haddock's curses book behind the fixation, the left eye sees the French press behind the fixation point. With both eyes open and fixating the book and the French press appear superimposed and straight ahead.

  6. Ewald Hering - Wikipedia

    en.wikipedia.org/wiki/Ewald_Hering

    The Hering illusion In 1861, Hering described an optical illusion which now bears his name – the Hering illusion . When two straight and parallel lines are presented in front of radial background (similar to the spokes of a bicycle), the lines appear as if they were bowed outwards.

  7. Bicycle saddle - Wikipedia

    en.wikipedia.org/wiki/Bicycle_saddle

    A bicycle saddle, sometimes called a bicycle seat, is one of five contact points on an upright bicycle, the others being the two pedals and the two handles on the handlebars. (A bicycle seat in the specific sense also supports the back.) [ 1 ] The bicycle saddle has been known as such since the bicycle evolved from the draisine , a forerunner ...