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See also Image:Trefoil-Architectural-Equilateral-Triangle-outlined.png, Image:Trefoil-Architectural-Equilateral-Triangle-interlaced.png, and Image:Quatrefoil-Architectural.png. For a sketch of a trefoil actually used in architecture, see Image:Rose.cathedrale.Sees.png. This is an SVG version of Image:Trefoil-Architectural.png.
An architectural trefoil (i.e. symmetrical pattern of three partially-overlapping circles) which is also a triquetra (i.e. simple threefold closed knot). Consists of three 300° circular arcs. For non-interlaced architectural trefoil, see File:Trefoil-Architectural.png , etc.
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To see that this is topologically equivalent to the more usual visual forms of the trefoil knot, look at image File:Trefoil-non-3-symm-flip demonstration.svg: For a more symmetrical 3-D version of this, see File:One-Twist Trefoil.png. Date: 2009: Source: Self-made graphic, converted from the following vector PostScript source code:
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The architectural quatrefoil combined with a square is the fourfold version of an architectural trefoil combined with an equilateral triangle (see Image:Trefoil-Architectural-Equilateral-Triangle-outlined.png and Image:Trefoil-Architectural-Equilateral-Triangle-interlaced.png). Date: 2005 (raster image and vector source); 2007 (SVG conversion ...
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