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  2. File:Vassily Kandinsky, 1913 - Color Study, Squares with ...

    en.wikipedia.org/wiki/File:Vassily_Kandinsky...

    Printable version; Page information; ... English: Color Study, Squares with Concentric Circles, sm ... 1930 or later are subjects of points 1-2 of this template. [3] ...

  3. Pencil (geometry) - Wikipedia

    en.wikipedia.org/wiki/Pencil_(geometry)

    It consists of a family of real circles, all tangent to each other at a single common point. The degenerate circle with radius zero at that point also belongs to the pencil. A family of concentric circles centered at a common center (may be considered a special case of a hyperbolic pencil where the other point is the point at infinity).

  4. Concentric circle - Wikipedia

    en.wikipedia.org/?title=Concentric_circle&...

    Print/export Download as PDF; Printable version; Appearance. move to sidebar hide. From Wikipedia, the free encyclopedia. Redirect page ...

  5. Hexafoil - Wikipedia

    en.wikipedia.org/wiki/Hexafoil

    The second circle is centered at any point on the first circle. All following circles are centered on the intersection of two other circles. The design is sometimes expanded into a regular overlapping circles grid. Bartfeld (2005) describes the construction: "This design consists of circles having a 1-[inch] radius, with each point of ...

  6. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    The two orange circles are exactly the same size; however, the one on the right appears larger. Ehrenstein illusion: The Ehrenstein illusion is an optical illusion studied by the German psychologist Walter Ehrenstein in which the sides of a square placed inside a pattern of concentric circles take an apparent curved shape. Fata Morgana (mirage)

  7. Inversive geometry - Wikipedia

    en.wikipedia.org/wiki/Inversive_geometry

    Circles G to J, which do not, map to other circles. The reference circle and line L map to themselves. Circles intersect their inverses, if any, on the reference circle. In the SVG file, click or hover over a circle to highlight it. Inversion of a line is a circle containing the center of inversion; or it is the line itself if it contains the ...

  8. Calendar Clock Face - Wikipedia

    en.wikipedia.org/wiki/Calendar_Clock_Face

    The fifth circle gives the division of the year in 365 calendar days; and the sixth circle shows the names of months. At the four corners, the four planets are represented by symbolic characters. In the topmost compartment of the fourth circle, the three brothers Massijs are seen: Josse, the eldest, busy mounting a church clock; Quentin ...

  9. Annulus (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Annulus_(mathematics)

    In mathematics, an annulus (pl.: annuli or annuluses) is the region between two concentric circles. Informally, it is shaped like a ring or a hardware washer. The word "annulus" is borrowed from the Latin word anulus or annulus meaning 'little ring'. The adjectival form is annular (as in annular eclipse).