WEBVTT

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One of the most remarkable aspects
of the human brain

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is its ability to recognize patterns
and describe them.

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Among the hardest patterns
we've tried to undestand

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is the concept of
turbulent flow in fluid dynamics.

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The German physicists 
Verner Heisenberg said,

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"When I meet God, I'm going to ask him
two questions:

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why relativity and why turbulence?

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I really believe he will have 
an answer for the first."

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As difficult as turbulence is to
understand mathematically,

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we can use art to depict the way it looks.

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In June 1889, Vincent Van Gogh painted
the view just before sunrise

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from the window of his room at the
Saint Paul de Mausole Asylumn

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in Saint-Rémy-de-Provence

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where he'd admitted himself after
mutilating his own ear

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in a psychotic epidosde.

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In the Starry Night, 
his circular brush strokes

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creates a night sky filled with
swirling clouds eddies of stars.

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Van Gogh and other impressionists
represented light in a different way

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than their predecessors,seeming to
capture its motion,

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for instance, across sun dappled waters,

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or here in star light that 
twinkles and melts

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through milky waves of blue night sky.

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The effect is caused my luminance,

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the intensity of the light in the colors 
on the canvas.

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The more primitive part of our
visual cortex,

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which sees light contrast and motion,
but not color,

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will blend two differently colored areas
together

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if they have the same luminance.

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But our brains primate
subdivision

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will see the contrasting colors
without blending.

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With these two interpretations
happening at once,

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the light in many impressionists' works
seems to pulse, flicker and radiate oddly.

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That's how this and other impressionists' 
works use quickly executted

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prominent brush strokes to capture
something strikingly real

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about how light moves.

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60 years later, Russian mathematician
Andrey Kolmogorov,

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furthered our mathematical understanding
of turbulence

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when he proposed that energy in a
turbulent fluid at length R

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varies in proportion to 
the 5/3rds power of R.

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Experimental measurements
show Kolmogorov

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was remarkably close to the 
way turbulent flow works.

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Although a complete description of
turbulence remains

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one of the unsolved problems in physics,

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a turbuletn flow is self-similar
if there is an energy cascade.

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In ther words, big eddies
transfer their energy to smaller eddies,

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which do likewise at other scales.

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Examples of this include Jupiter's
great red spot,

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cloud formations and
interstellar dust particles.

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In 2004, using the Hubble space telescope,


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scientists saw the eddies of a distant
cloud of dust and gas around a star,

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and it reminded them of Van Gogh's Starry Night.

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This motivated scientists from Mexico, 
Spain and England

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to study the luminence in Van Gogh's
paintings in detail.

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They discovered that there is a distinct
pattern of turbulent fluid structures

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close to Kolmogorov's equation
hidden in many of Van Gogh's paintings.

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The researchers digitized the paintings,

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and measured how brightness varies between
any two pixels.

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From the curves measured for
pixel separations,

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they concluded that paintings from
Van Gogh's period of psychotic aggetation

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behave remarkably similar 
to fluid turbulence.

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His self portait with a pipe from
a calmer period in Van Gogh's life

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show no sign of this correspondence.

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And neither did other artists' work that
seemed equally trubulent at first glance,

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like Munch's 'The Scream."

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While it's too easy to say Van Gogh's
turbulent genius

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enabled him to depict turbulence,

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its also far too difficult to accurately
express the rousing beauty of the fact

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that in a period of intense suffering,

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Van Gogh was somehow able to
perceive and represent

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one of the most supremely difficult
concepts

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nature has ever brought before mankind,

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And to unite his unique mind's eye


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with the deepest mysteries
of movement, fluid and light.