How to teach the allegory of the cave

Why this matters

Most students can retell the allegory of the cave and still stop at "the shadows are fake," often as "don't trust the internet." That reading skips the prisoners who would rather keep their shadows than believe the one who comes back. A written summary rarely shows which students stopped at "fake," so the teacher has to wait for the essay to find out.

What happens in the allegory of the cave

At the start of Book VII of Plato's Republic (514a-520a), Socrates asks Glaucon to picture people chained in an underground cave since childhood, able to see only the wall in front of them (Jowett translation, MIT Internet Classics Archive; section numbers from Perseus). Each part of the story stands for something:

• The shadows are cast on the wall by objects carried past a fire behind the prisoners. To them, "the truth would be literally nothing but the shadows of the images."
• The fire makes the only light in the cave. Socrates explains that "the prison-house is the world of sight, the light of the fire is the sun."
• The way out is a "steep and rugged ascent" that hurts the freed prisoner's eyes, and Socrates calls it "the ascent of the soul into the intellectual world."
• The sun outside stands for the idea of the good, which "appears last of all, and is seen only with an effort."
• The return leaves the freed prisoner's eyes "full of darkness," the others say he came back "without his eyes," and they would put to death anyone who tried to lead them up.

The cave is the last of three images Plato uses for one climb, after the Sun and the Divided Line: the ascent "from the world of the senses to the world of intelligence and truth," which ends at the Form of the Good (Stanford Encyclopedia of Philosophy).

In the Flint activity, Sparky makes each student a short video of the cave and asks what its parts stand for in something the student watches. Unlike a worksheet, Sparky sends an answer that stops at "the shadows are fake" back to the prisoner who returns.

Sparky gets Sofia past "the shadows are fake"

Sofia ends up explaining why the prisoners turn on the one who returns, using her own highlights feed. Every student gets the same activity and their own cave video, and Sparky's questions depend on what each student watches and answers.

Sparky works from Sofia's own feedSparky sends Sofia back to the prisoner who returnsA right answer gets a harder question

S

Sofia

Interest: Short-video apps and sports highlightsStarting point: Reads the allegory as "don't trust the internet"

Sparky

There it is, Sofia: the cave story, start to finish, no spoilers on what it means yet. What do the shadows, the fire, and the sun each stand for? And how might the cave look like your TikTok and YouTube Shorts feed?

Sofia

ok so the shadows are fake stuff, like whats on my feed. the fire is whatever makes the shadows and the sun is real life. so basically its saying dont trust the internet lol

Sparky

"Don't trust the internet" is a solid start! Think about the prisoner who goes back into the cave at the end of the video. What happens when he returns, and what does that tell you about what the shadows mean to the prisoners still inside?

Sofia

the video ends with him going back down. i guess he tries to tell them about outside and they dont believe him? bc the shadows are all theyve ever seen. so to them the shadows arent fake, theyre like the whole world

Sparky

The shadows aren't fake to the prisoners. They're the only reality they've ever known. So now think about your feed: who are the people carrying the objects in front of the fire in your soccer and NBA highlights world?

Sofia

the people who make the clips i guess, like the accounts and espn and the algorithm picks which ones i see. they only post the crazy goals and dunks, not the whole game where nothing happens for like 20 min

Understanding check

Here's a harder question: when the freed prisoner goes back into the cave, the other prisoners turn on him. Plato suggests they'd even try to kill him. Why do you think that is?

Sofia

bc hes telling them everything they know is wrong and they dont want to hear it. and he probably looks dumb bc his eyes arent used to the dark anymore so he cant even play their shadow game

Explained why the prisoners turn on the one who returns

Sofia is an example student, and Sparky's replies are shortened. The chat leaves out her first message, where she named what she watches, and one exchange where she said the sun is seeing the whole game.

What Flint did for Sofia

• Sparky made Sofia a narrated video of the cave, then asked how the cave looks like her own highlights feed.
• When Sofia stopped at "don't trust the internet," Sparky sent her back to the prisoner who returns instead of telling her what the shadows mean.
• Once Sofia had mapped the shadows, the people carrying the objects and the sun onto her feed, Sparky asked why the prisoners turn on the one who comes back.

A teacher can't do this by hand for 30 students, and Sparky does it in every student's chat.

The activity page shows who still reads the cave as "don't trust the internet"

While the class works, Needs attention shows the teacher which student is stuck and on which message. After three or more students submit, activity analytics lists what the class explained well, where students went wrong, and a follow-up to practice next.

Set up the activity for free

Open the allegory of the cave activity in Flint's public library, select Use activity to copy it into a free Flint account, and assign it to a class. No setting needs turning on: the activity's guidelines ask Sparky to make the cave video in each student's chat after the student says what they watch. Sparky takes a few minutes to make the video, and the video is narrated, so students need sound or headphones.

For more ethics activities, see Flint for ethics.