File:Seven-circles-heptagram.png

Ornamental interlaced heptagram design consisting exclusively of intersecting circular arcs. Self-made, declared to be in public domain, generated from the following PostScript source code:

%!
300 396 translate 8 7 div dup scale/y{360 7 div}def/x{100 y 2 div sin
mul}def/A{0 100 x 0 360 arc closepath stroke 1 1 6{y mul 90 add/z exch
def z cos 100 mul z sin 100 mul x 0 360 arc closepath stroke}for}def 48
setlinewidth A 32 setlinewidth .7 .8 .9 setrgbcolor A 8 setlinewidth 0
setgray 7{0 100 x 20 add 360 y 2 div sub 383 arc stroke 0 100 x 20 add
180 y 2 div add 254.5 arc stroke y rotate}repeat showpage
%EOF