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Subtle Agroecologies
FIGURE 25.5 Ring vortex viewed from the side, made using marker dye in water, pushed in a slow pulse from
the tube below. (Photo credit: by kind permission Andreas Wilkens, Institute of Flow Sciences, Herrischried,
Germany, www.stroemungsinstitut.de.)
FIGURE 25.6 Water falling into a pool by Leonardo da Vinci, circa 1511. Original drawing held in the Royal
Library Windsor (no 12660). (Reproduction courtesy Royal Collection Trust/© Her Majesty Queen Elizabeth
II 2020.)