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What is reality, knowledge, the meaning of life?
Big topics you might tackle figuratively
explaining existence as a journey down a road or across an ocean,
a climb, a war, a book, a thread, a game, a window of opportunity,
or an all-too-short-lived flicker of flame.
2,400 years ago,
one of history's most famous thinkers said life is like being chained up in a cave,
forced to watch shadows flitting across a stone wall.
Pretty cheery, right?
That's actually what Plato suggested in his Allegory of the Cave,
found in Book VII of "The Republic,"
in which the Greek philosopher envisioned the ideal society
by examining concepts like justice, truth and beauty.
In the allegory, a group of prisoners have been confined in a cavern since birth
with no knowledge of the outside world.
They are chained, facing a wall, unable to turn their heads,
while a fire behind them gives off a faint light.
Occasionally, people pass by the fire, carrying figures of animals and other objects that cast shadows on the wall.
The prisoners name and classify these illusions,
believing they're perceiving actual entities.
Suddenly, one prisoner is freed and brought outside for the first time.
The light hurts his eyes and he finds the new environment disorienting.
When told that the things around him are real,
while the shadows were mere reflections, he cannot believe it.
The shadows appeared much clearer to him.
But gradually, his eyes adjust
until he can look at reflections in the water,
at objects directly,
and finally at the Sun,
whose light is the ultimate source of everything he has seen.
The prisoner returns to the cave to share his discovery,
but he is no longer used to the darkness,
and has a hard time seeing the shadows on the wall.
The other prisoners think the journey has made him stupid and blind,
and violently resist any attempts to free them.
Plato introduces this passage as an analogy
of what it's like to be a philosopher trying to educate the public.
Most people are not just comfortable in their ignorance
but hostile to anyone who points it out.
In fact, the real life Socrates was sentenced to death
by the Athenian government for disrupting the social order,
and his student Plato spends much of "The Republic"
disparaging Athenian democracy,
while promoting rule by philosopher kings.
With the cave parable,
Plato may be arguing that the masses are too stubborn and ignorant
to govern themselves.
But the allegory has captured imaginations for 2,400 years
because it can be read in far more ways.
Importantly, the allegory is connected to the theory of forms,
developed in Plato's other dialogues,
which holds that like the shadows on the wall,
things in the physical world are flawed reflections of ideal forms,
such as roundness, or beauty.
In this way, the cave leads to many fundamental questions,
including the origin of knowledge,
the problem of representation,
and the nature of reality itself.
For theologians, the ideal forms exist in the mind of a creator.
For philosophers of language viewing the forms as linguistic concepts,
the theory illustrates the problem of grouping concrete things
under abstract terms.
And others still wonder whether we can really know
that the things outside the cave are any more real than the shadows.
As we go about our lives,
can we be confident in what we think we know?
Perhaps one day,
a glimmer of light may punch a hole in your most basic assumptions.
Will you break free to struggle towards the light,
even if it costs you your friends and family,
or stick with comfortable and familiar illusions?
Truth or habit? Light or shadow?
Hard choices, but if it's any consolation, you're not alone.
There are lots of us down here.
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【TED-Ed】柏拉圖的洞穴寓言 (Plato’s Allegory of the Cave - Alex Gendler)

10746 分類 收藏
稲葉白兎 發佈於 2015 年 3 月 19 日
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