Again this seed shape has passive green lines for the stem, but now 2 self-replicating lines for the "growing tip." Additional examples (queen anne's lace, fern) are available from the "Seed" dropdown menu. What is the evolutionary advantage of fractals? They combine a maximum of surface area with a maximum of flow, so trees take in more light, lungs exchange more oxygen, kidneys filter more waste, neurons connect with more neurons. Plants in the desert need to conserve water, so they tend to have a lower fractal dimension (a cactus has less surface area per volume than a fern). And DNA itself is a recursive loop, so it may be that fractals naturally arise from mutation.