Comprising an outer ring of eight, eight pointed stars, each star is made of eight kites. Then inscribed within this ring is eight arrows that inscribe another central eight pointed star comprised of kites. Inscribed inside the central star are eight isosceles triangles, culminating in a central octagon.
Euclid’s Elements – Book 1 – Definitions, definition XXII, simply says:
“A quadrilateral figure is one which is bounded by four sides.”
So any four sided shape is a quadrilateral. The shape I use in this piece is a form of a quadrilateral that Euclid describes as a kite. Yes, it’s the shape your thinking of, like the traditional flying kite shape.
Per Wikipedia: In Euclidean geometry, a kite is a quadrilateral whose four sides can be grouped into two pairs of equal-length sides that are adjacent to each other. In contrast, a parallelogram also has two pairs of equal-length sides, but they are opposite to each other rather than adjacent.
The diagonals of a kite are always perpendicular to each other.