The right flower is filled with thick, soft grey, lines : the freshest ones hide those below, it's the opaque mode we're used to.
The left one is filled with dark but very thin lines : overlapping creates transparency of soft greys. Not actual transparency - a pile of thin fabric sheets gives a better idea.
startshape scene
rule scene {
leafTransparent [ s 1 4 x 0.5 ]
leafTransparent [ r 90 s 1 4 x 0.5 ]
leafTransparent [ r 180 s 1 4 x 0.5 ]
leafTransparent [ r 270 s 1 4 x 0.5 ]
leafOpaque [ x 2.1 s 1 4 x 0.5 ]
leafOpaque [ x 2.1 r 90 s 1 4 x 0.5 ]
leafOpaque [ x 2.1 r 180 s 1 4 x 0.5 ]
leafOpaque [ x 2.1 r 270 s 1 4 x 0.5 ]
}
rule leafTransparent {
// dark
_leafTransparent { x -0.5 b 0.4 }
_leafTransparent { x -0.5 flip 0 b 0.6 }
}
rule _leafTransparent {
# thin fill
SQUARE { x 0.5 s 1 0.0001 }
CIRCLE { x 1 s 0.01 b -1 } # border
_leafTransparent { x -0.00001 r 0.02 s .999}
}
rule leafOpaque {
// light
_leafOpaque { x -0.5 b 0.8 }
_leafOpaque { x -0.5 flip 0 b 0.9 }
}
rule _leafOpaque {
# thick fill
SQUARE { x 0.5 s 1 0.001 }
CIRCLE { x 1 s 0.01 b -1 } # border
_leafOpaque { x -0.00001 r 0.02 s .999}
}
startshape lotus
rule lotus {
leafTransparent [ s 1 1 x 0.5 ]
leafTransparent [ r 15 s 1 1 x 0.5 ]
leafTransparent [ r 30 s 1 1 x 0.5 ]
leafTransparent [ r 45 s 1 1 x 0.5 ]
leafTransparent [ r 60 s 1 1 x 0.5 ]
leafTransparent [ r 75 s 1 1 x 0.5 ]
leafTransparent [ r 90 s 1 1 x 0.5 ]
leafTransparent [ r 105 s 1 1 x 0.5 ]
leafTransparent [ r 120 s 1 1 x 0.5 ]
leafTransparent [ r 135 s 1 1 x 0.5 ]
leafTransparent [ r 150 s 1 1 x 0.5 ]
leafTransparent [ r 165 s 1 1 x 0.5 ]
leafTransparent [ r 180 s 1 1 x 0.5 ]
leafTransparent [ r 195 s 1 1 x 0.5 ]
leafTransparent [ r 210 s 1 1 x 0.5 ]
leafTransparent [ r 225 s 1 1 x 0.5 ]
leafTransparent [ r 240 s 1 1 x 0.5 ]
leafTransparent [ r 255 s 1 1 x 0.5 ]
leafTransparent [ r 270 s 1 1 x 0.5 ]
leafTransparent [ r 285 s 1 1 x 0.5 ]
leafTransparent [ r 300 s 1 1 x 0.5 ]
leafTransparent [ r 315 s 1 1 x 0.5 ]
leafTransparent [ r 330 s 1 1 x 0.5 ]
leafTransparent [ r 345 s 1 1 x 0.5 ]
}
rule leafTransparent {
_leafTransparent { x -0.5 b 0.2 }
_leafTransparent { x -0.5 flip 0 b 0.4 }
}
rule _leafTransparent {
TRIANGLE { x 0.5 s 1 0.0001 }
CIRCLE { x 1 s 0.01 b -1 }
_leafTransparent { x -0.00001 r 0.02 s .999 b 0.01}
}
It looks like a Lotus flower. I really enjoyed the intereference between the petals.