I don't know what to call it, but I like it:
startshape FOO
rule FOO 6{
CIRCLE {}
FOO { x 0 y .1 s .95 b .1 r 6 }
}
rule FOO 5 {
CIRCLE {}
FOO { x .1 y .1 s 1.05 b -.1 r 6 }
}
Worm tracks (?)
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