Plato was right. Earth is made, on average, of cubes
The ancient Greek philosopher was on to something, researchers found


Date:
July 20, 2020
Source:
University of Pennsylvania
Summary:
The ancient philosopher Plato posited the shapes of the building
blocks of the universe. According to him, the earth was formed
of cubes.

Researchers now find a fundamental truth in that premise. Studying
the shapes and fragmentation patterns of a variety of rocks,
they found that the average of all their forms is a cube.



FULL STORY ========================================================================== Plato, the Greek philosopher who lived in the 5th century B.C.E.,
believed that the universe was made of five types of matter: earth, air,
fire, water, and cosmos. Each was described with a particular geometry,
a platonic shape. For earth, that shape was the cube.


========================================================================== Science has steadily moved beyond Plato's conjectures, looking instead
to the atom as the building block of the universe. Yet Plato seems to
have been onto something, researchers have found.

In a new paper in the Proceedings of the National Academy of Sciences,
a team from the University of Pennsylvania, Budapest University of
Technology and Economics, and University of Debrecen uses math, geology,
and physics to demonstrate that the average shape of rocks on Earth is
a cube.

"Plato is widely recognized as the first person to develop the concept of
an atom, the idea that matter is composed of some indivisible component
at the smallest scale," says Douglas Jerolmack, a geophysicist in
Penn's School of Arts & Sciences' Department of Earth and Environmental
Science and the School of Engineering and Applied Science's Department
of Mechanical Engineering and Applied Mechanics. "But that understanding
was only conceptual; nothing about our modern understanding of atoms
derives from what Plato told us.

"The interesting thing here is that what we find with rock, or earth, is
that there is more than a conceptual lineage back to Plato. It turns out
that Plato's conception about the element earth being made up of cubes
is, literally, the statistical average model for real earth. And that
is just mind- blowing." The group's finding began with geometric models developed by mathematician Ga'bor Domokos of the Budapest University of Technology and Economics, whose work predicted that natural rocks would fragment into cubic shapes.



========================================================================== "This paper is the result of three years of serious thinking and work,
but it comes back to one core idea," says Domokos. "If you take a three-dimensional polyhedral shape, slice it randomly into two fragments
and then slice these fragments again and again, you get a vast number of different polyhedral shapes. But in an average sense, the resulting shape
of the fragments is a cube." Domokos pulled two Hungarian theoretical physicists into the loop: Ferenc Kun, an expert on fragmentation, and
Ja'nos To"ro"k, an expert on statistical and computational models. After discussing the potential of the discovery, Jerolmack says, the Hungarian researchers took their finding to Jerolmack to work together on the
geophysical questions; in other words, "How does nature let this happen?"
"When we took this to Doug, he said, 'This is either a mistake, or this
is big,'" Domokos recalls. "We worked backward to understand the physics
that results in these shapes." Fundamentally, the question they answered
is what shapes are created when rocks break into pieces. Remarkably,
they found that the core mathematical conjecture unites geological
processes not only on Earth but around the solar system as well.

"Fragmentation is this ubiquitous process that is grinding down
planetary materials," Jerolmack says. "The solar system is littered
with ice and rocks that are ceaselessly smashing apart. This work gives
us a signature of that process that we've never seen before." Part of
this understanding is that the components that break out of a formerly
solid object must fit together without any gaps, like a dropped dish on
the verge of breaking. As it turns out, the only one of the so-called
platonic forms -- polyhedra with sides of equal length -- that fit
together without gaps are cubes.



==========================================================================
"One thing we've speculated in our group is that, quite possibly Plato
looked at a rock outcrop and after processing or analyzing the image subconsciously in his mind, he conjectured that the average shape is
something like a cube," Jerolmack says.

"Plato was very sensitive to geometry," Domokos adds. According to lore,
the phrase "Let no one ignorant of geometry enter" was engraved at the
door to Plato's Academy. "His intuitions, backed by his broad thinking
about science, may have led him to this idea about cubes," says Domokos.

To test whether their mathematical models held true in nature, the
team measured a wide variety of rocks, hundreds that they collected and thousands more from previously collected datasets. No matter whether the
rocks had naturally weathered from a large outcropping or been dynamited
out by humans, the team found a good fit to the cubic average.

However, special rock formations exist that appear to break the cubic
"rule." The Giant's Causeway in Northern Ireland, with its soaring
vertical columns, is one example, formed by the unusual process of
cooling basalt. These formations, though rare, are still encompassed
by the team's mathematical conception of fragmentation; they are just
explained by out-of-the-ordinary processes at work.

"The world is a messy place," says Jerolmack. "Nine times out of 10,
if a rock gets pulled apart or squeezed or sheared -- and usually these
forces are happening together -- you end up with fragments which are,
on average, cubic shapes. It's only if you have a very special stress
condition that you get something else. The earth just doesn't do this
often." The researchers also explored fragmentation in two dimensions,
or on thin surfaces that function as two-dimensional shapes, with a
depth that is significantly smaller than the width and length. There,
the fracture patterns are different, though the central concept of
splitting polygons and arriving at predictable average shapes still holds.

"It turns out in two dimensions you're about equally likely to get
either a rectangle or a hexagon in nature," Jerolmack says. "They're
not true hexagons, but they're the statistical equivalent in a geometric
sense. You can think of it like paint cracking; a force is acting to pull
the paint apart equally from different sides, creating a hexagonal shape
when it cracks." In nature, examples of these two-dimensional fracture patterns can be found in ice sheets, drying mud, or even the earth's
crust, the depth of which is far outstripped by its lateral extent,
allowing it to function as a de facto two- dimensional material. It was previously known that the earth's crust fractured in this way, but the
group's observations support the idea that the fragmentation pattern
results from plate tectonics.

Identifying these patterns in rock may help in predicting phenomenon
such as rock fall hazards or the likelihood and location of fluid flows,
such as oil or water, in rocks.

For the researchers, finding what appears to be a fundamental rule of
nature emerging from millennia-old insights has been an intense but
satisfying experience.

"There are a lot of sand grains, pebbles, and asteroids out there, and
all of them evolve by chipping in a universal manner," says Domokos,
who is also co- inventor of the Go"mbo"c, the first known convex shape
with the minimal number -- just two -- of static balance points. Chipping
by collisions gradually eliminates balance points, but shapes stop short
of becoming a Go"mbo"c; the latter appears as an unattainable end point
of this natural process.

The current result shows that the starting point may be a similarly
iconic geometric shape: the cube with its 26 balance points. "The fact
that pure geometry provides these brackets for a ubiquitous natural
process, gives me happiness," he says.

"When you pick up a rock in nature, it's not a perfect cube, but each one
is a kind of statistical shadow of a cube," adds Jerolmack. "It calls to
mind Plato's allegory of the cave. He posited an idealized form that was essential for understanding the universe, but all we see are distorted
shadows of that perfect form."

========================================================================== Story Source: Materials provided by University_of_Pennsylvania. Note:
Content may be edited for style and length.


========================================================================== Journal Reference:
1. Ga'bor Domokos, Douglas J. Jerolmack, Ferenc Kun, Ja'nos
To"ro"k. Plato's
cube and the natural geometry of fragmentation. Proceedings of
the National Academy of Sciences, 2020; 202001037 DOI: 10.1073/
pnas.2001037117 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/07/200720112214.htm

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