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: c push negate swap negate y x z+ dup * swap dup * + pop dup * < ;
: l push -rot negate swap negate y x z+ 2dup dup * swap dup * + pop dup * < push atan2 - abs 0.05 < pop * ;
: p dup rot dup sin swap cos rot * -rot * rot + -rot + swap ;
: a t 3 * sin ;
: b a 1.1 * ;
: m x 10 * + + sin 1 over dup * - sqrt atan2 swap / y 0.6 - > ;
0.5 0.7 -1.57 0.3 l
0.5 0.4 -1.57 a + 0.15 l +
0.5 0.4 -1.57 a + 0.15 p -2 b + 0.2 l +
0.5 0.4 -1.57 a - 0.15 l +
0.5 0.4 -1.57 a - 0.15 p -2 b - 0.2 l +
0.5 0.6 -1.57 a + 0.1 l +
0.5 0.6 -1.57 a + 0.1 p -0.5 b + 0.1 l +
0.5 0.6 -1.57 a - 0.1 l +
0.5 0.6 -1.57 a - 0.1 p -0.5 b - 0.1 l +
0.5 0.7 0.05 c +
dup 0 swap
15 1 t 2 / m 20 3 t m +
25 0 t 4 / m 35 4 t 4 / m + +
y 0.2 > *
+