View source for File:Pentagram-ribbon-folded.png

Folded pentagrammic ribbon, single-sided (more complex version of Moebius Strip).

Self-made, declared to be in public domain, generated from the following PostScript source code:
<pre>%!
306 396 translate 1.85 dup scale 1.5 setlinewidth 1 setlinejoin/x 18 sin
18 cos div 100 mul def/y 100 18 sin 100 mul 108 sin x mul add sub x 100
div mul def/A{gsave -54 cos 100 mul 36 cos x mul add -54 sin 100 mul 36
sin x mul add moveto -54 cos 100 mul -144 cos x mul add -54 sin 100 mul
-144 sin x mul add lineto 0 0 lineto x 2 mul 0 lineto closepath gsave fill
grestore 0 setgray stroke grestore x 100 moveto x y add 18 sin 100 mul 108
sin x mul add lineto x y sub 18 sin 100 mul 108 sin x mul add lineto
closepath gsave fill grestore 0 setgray stroke}def .8 .1 .8 setrgbcolor A
72 rotate 0 .8 0 setrgbcolor A 72 rotate .875 0 0 setrgbcolor A 72 rotate
.1 .1 .925 setrgbcolor A 72 rotate .95 .9 0 setrgbcolor A showpage
%EOF</pre>