Generated from five circles which intersect at the ten points of a pentagram (run the vector PostScript source code given below to see the geometrical construction lines).

Self-made image, converted from a version of the following vector PostScript source code:

%!
306 396 translate 1.6 dup scale/L 72 sin 54 sin div 5 sqrt 1
add 2 div mul 64 mul def/Q{72 mul 18 sub/x exch def x cos 64
mul x sin 64 mul L}def 0.133 0.58 0.2 setrgbcolor 1 1 5{Q 0
360 arc closepath fill}for 1 setgray 1.3 setlinewidth 1 1
5{Q x 162 add x 198 add arc 0 0 lineto closepath gsave fill
grestore stroke}for 30.482 5.3 div setlinewidth 1 1 5{Q x 54
sub x 198 add arc stroke}for 0 setgray 3.75 5.3 div
setlinewidth 1 1 5{Q 0 360 arc closepath stroke}for 2
setlinejoin/q L 18 cos mul 54 sin 64 mul add def 0.941 0 0
setrgbcolor 0 q moveto 1 1 4{144 mul 90 add/x exch def x cos
q mul x sin q mul lineto}for closepath stroke showpage
%EOF