startshape r0
background {b -1}
rule r0{16*{a -0.2}r1{b 1}}

rule r1 {r2[] r2[s 0.5 x 2.5] r1[x 2.5]}
rule r1 {r2[] r2[s 0.5 y 2.5] r1[y 2.5]}
rule r1 {r1[skew 0 5]}
rule r1 {r1[skew 0 -5]}
rule r1 0.3 {r1 {f 0} r1 {f 45}}
rule r1 {r1[s 0.8]}

rule r2 {r4{a -100 b -100 } r3{}}
rule r4 {CIRCLE[a 0.008 b 0.8 s 10]}

rule r3 { CIRCLE{}}
rule r3 { TRIANGLE{}}
rule r3 { SQUARE{}}
rule r3 { r3{b 1} r3{r 45 b -1 s 0.8}}
rule r3 4 {r3{s 0.9}}