startshape fig4 background { b -1}

rule fig4 {

fig3 { r -45 x -1.3}
fig3 { r +45 x +1.3 flip +90}
fig3 { r 180 y -.5 x +1.5}
fig3 { r 180 y -.5 x -1.5 flip +90}

}

rule fig3 {

fig2 { }
fig3 { s .9 hue 14 y 1 r 45}

}

rule fig2 {

fig1 { }
fig2 { s .9 r 30 x .25 hue 4.5}

}

rule fig1 {

SQUARE { sat .8 b 0 hue 6}
fig1 { s .9 b .05 r 45 x .5}

}