AU­TUMN LEAF

Cosmos - - Gallery - CREDIT: PAUL OOMEN / GETTY IM­AGES

The net­work of veins that move flu­ids in­side a leaf shows clear fractal struc­ture, as larger ves­sels re­peat­edly branch into smaller ones. An­i­mal cir­cu­la­tion is sim­i­lar.

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