background { a -1 }
startshape init

rule init{
    four{ sat 1 b .8 }
}

rule four{
    SQUARE{}
    four{s .4 y .333 x -.333 b .8 hue 10}
    four{s .4 y .333 x .333 b .8 hue 10}
    four{s .4 y -.333 x -.333 b .8 hue 10}
    four{s .4 y -.333 x .333 b .8 hue 10}
}