Keywords: Pentagram-ribbon-folded.svg Schematic depiction of a strip or ribbon of flat material knotted in a pentagram The resulting ribbon is single-sided a more complex version of a Möbius strip Self-made graphic converted from the following vector PostScript source code <pre> 306 396 translate 1 85 dup scale 1 5 setlinewidth 1 setlinejoin/z 1 18 cos div 100 mul def/x 18 sin z mul def/y 100 18 sin 100 mul 108 sin x mul add sub x 100 div mul def/A gsave -36 cos z mul -36 sin z mul moveto -72 cos z mul -72 sin z mul 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> 2010 AnonMoos Moebius surfaces Pentagrams Decorative knots Images with PostScript source code Strip folding |