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  2. Overlapping circles grid - Wikipedia

    en.wikipedia.org/wiki/Overlapping_circles_grid

    An overlapping circles grid is a geometric pattern of repeating, overlapping circles of an equal radius in two-dimensional space. Commonly, designs are based on circles centered on triangles (with the simple, two circle form named vesica piscis ) or on the square lattice pattern of points.

  3. Fraser spiral illusion - Wikipedia

    en.wikipedia.org/wiki/Fraser_spiral_illusion

    The overlapping black arc segments appear to form a spiral; however, the arcs are a series of concentric circles. The visual distortion is produced by combining a regular line pattern (the circles) with misaligned parts (the differently colored strands). [2]

  4. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    The overlapping black arc segments appear to form a spiral; however, the arcs are a series of concentric circles. Gravity hill: Grid illusion: Any kind of grid that deceives a person's vision. The two most common types of grid illusions are the Hermann grid illusion (1870) and the scintillating grid illusion (1994).

  5. Concentric objects - Wikipedia

    en.wikipedia.org/wiki/Concentric_objects

    The region of the plane between two concentric circles is an annulus, and analogously the region of space between two concentric spheres is a spherical shell. [6] For a given point c in the plane, the set of all circles having c as their center forms a pencil of circles. Each two circles in the pencil are concentric, and have different radii.

  6. Mysterious series of circles discovered atop frozen Alaska ...

    www.aol.com/mysterious-series-circles-discovered...

    Some suspected the circles resulted from a “huge gas bubble” that emerged from the lake bed, while others wondered if something mysterious caused the surface of a frozen lake to ripple.

  7. 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).

  8. 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 ...

  9. Doyle spiral - Wikipedia

    en.wikipedia.org/wiki/Doyle_spiral

    A Doyle spiral is defined to be a certain type of circle packing, consisting of infinitely many circles in the plane, with no two circles having overlapping interiors. In a Doyle spiral, each circle is enclosed by a ring of six other circles. The six surrounding circles are tangent to the central circle and to their two neighbors in the ring ...