Ornamental interlaced "Solomon's knot" design made solely from circular arcs belonging to four circles whose centers are at the vertices of a square.
Self-made image, generated from the following vector PostScript source code:

%!
300 396 translate 48 setlinewidth/B{100 0 360 arc
closepath stroke}def/A{-100 -100 B -100 100 B 100
-100 B 100 100 B}def A 30 setlinewidth .7 .8 .9
setrgbcolor A 9 setlinewidth 0 setgray 4{100 100
119.5 144.5 180 arc stroke 100 100 119.5 234.5
270 arc stroke 90 rotate}repeat showpage
%EOF
AnonMoos