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Geometric Art: Isolines, Triquetra, Celtic Knotwork,
Trefoil Knot,
Parallel Lines, Geometry
for Kids, Software, iPad
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![Geometric art: Isolines, Triquetra, Celtic Knotwork, Trefoil Knot, Parallel Lines, Geometry for Kids, Software, iPad](geometric-art-celtic-triquetra-isoline-tablet-software-ipad-7.jpg)
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Isoline
An isoline or contour line of a function of two variables
is a curve along which the function has a constant value. Isolines usually have a parallel trend.
Parallel lines are lines in a plane which do not intersect or touch each other at any point.
Triquetra
Triquetra was used to refer to various three-cornered shapes. Topologically, the interlaced form of the plain triquetra is a trefoil knot. The triquetra is often used artistically as a design element when Celtic knotwork is used.
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