Can You Solve This Shadow Illusion?

When sunlight shines through a small hole, it casts a circular image on the wall regardless of the shape of the hole. The size of the hole also doesn't affect the size of the image.
This counterintuitive demonstration shows that the hole is acting like a pinhole camera, producing an image of the sun on the wall. Therefore the size and shape of the hole have no effect on the size and shape of the image.

[vwrjeep]

“What are we going to see?”

Camera man: “Nothing.”

[RobertFrisbeeTAM]

I love how Derek doesn't tear people down, but builds them up.

[VK-pkuz]

Right at the end there, when the girl said she didn't know but you guided her to realise she actually did know, that was amazing. Socratic questioning done perfectly.

[fedor]

not one time was the camera focussed :/

[patuszodi]

3:00 was inspirational. Derek is such an amazing teacher/mentor. I just love how he brought out the answer from that lady.

[Thepc]

Everyone “We see a circle!”
Camera man “Not on my watch you won’t!”

[commenturthegreat]

How can you know for certain It's a circle if THE CAMERA IS NEVER FOCUSED

[AverageAlien]

I'm so glad this guy is really inclusive and allows people with visual impairments to hold the camera

[yuyurolfer]

2:42
"What we're looking at there is actually an image of the Sun"
"Really??"
* Looks at the sun to check if it's circular *

[brunovaz]

If I ever want to show someone how it feels to have myopia I show them this video

[roryreddog]

When I was a kid during a solar eclipse, light filtered through our tree onto our house and made thousands of crescent 🌙 shapes. This explains why...

[pay]

3:18 Fantastic angle of the subject of the video...

[williamchen]

2019: let's put this in recommendation

[MrSlimJimProductions]

2:00 Man, what a straight-up, honest individual. I wish the world had more people like him.

[matszz]

An animation that explains how the sun rays travel to create this would have been helpful.

[muntasirmahinsiam]

Camera: How much blurry do you want?
Cameraman: *YES*

[NickYT]

1:03 "It must be the sun..."
Derek: :D! THAT'S RI--
"...playing tricks with my mind"
Derek: *SO CLOSE*

[ohyehyeh]

Don't do drugs kids or you will have the skills of that camera man

[bilal]

You needed a second camera man, this was so frustrating to watch

[jacobsteinebronn]

This effect is really cool during a partial solar eclipse, you see crescent shapes instead of circles