View source for File:Two-trefoils-L10a108.png

Two interlinked trefoil knots ([[3_1]]).

Self-made, declared to be public domain, generated from the following PostScript source:

<pre>%!
388 396 translate 90 rotate .26875 dup scale 1 -1 scale/factor 250
1.456696 mul def/radius 100 5000 sqrt add 1.456696 mul def/z{factor
dup mul 2 div sqrt}def/Q{factor dup mul 6 div sqrt neg}def/W{factor
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setlinewidth C z neg Q radius 330 90 arcn z Q radius 90 210 arcn 0
W radius 210 330 arcn closepath gsave 72 setlinewidth 0 setgray
stroke grestore stroke 72 setlinewidth 0 setgray 3{-232 100 moveto
119 0 rlineto stroke 120 rotate}repeat 36 setlinewidth C 3{-234 100
moveto 123 0 rlineto stroke 120 rotate}repeat grestore}def A/C{.92
.96 1 setrgbcolor}def gsave 0 -659 translate -1 -1 scale A grestore
72 setlinewidth 0 setgray z neg Q radius 303 322 arc stroke z Q
radius 303 322 arc stroke 36 setlinewidth .87 .97 .87 setrgbcolor z
neg Q radius 302 323 arc stroke z Q radius 302 323 arc stroke
showpage
%EOF</pre>