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Let's Know Things

Adversarial Technology

Let's Know Things

Colin Wright

News Commentary, News

4.8593 Ratings

🗓️ 25 February 2020

⏱️ 26 minutes

🧾️ Download transcript

Summary

This week we talk about countershading, microphone jamming, and dazzle camouflage.


We also discuss facial recognition, adversarial makeup, and infrared-reflecting sunglasses.



This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit letsknowthings.substack.com/subscribe

Transcript

Click on a timestamp to play from that location

0:00.0

Countershading is a form of camouflage where an animal will be lighter on the bottom and darker on the top.

0:22.0

This camouflage method is thought to be beneficial because these animals will tend to be darker

0:26.4

in situ on the bottom, because of the shadow cast by their bodies from the sun, shining down

0:32.1

on them from above.

0:33.2

To be naturally lighter, down where they will be shadowed then, can cause them to flatten from the

0:39.2

point of view of a potential predator. Denying that predator three-dimensional information about

0:44.1

that camouflaged animal that might allow them to fully comprehend its size, its shape, where its

0:49.1

wings or fins or legs or eyes are located, and in which direction that animal is moving or facing.

0:56.0

Disruptive coloration is another natural method of camouflage found across the animal kingdom.

1:01.5

Creatures with this type of coloration tend to blend into their environment,

1:05.4

their outlines broken up by strangely high-cont contrast patterns across their bodies.

1:11.6

Many types of snake, bird, and large cat utilize disruptive coloration, as do giraffes.

1:18.6

Though like most creatures with these patterns, when outside their normal ecosystem, their coloration stands out in a big way.

1:25.6

A giraffe anywhere but their savanna habitat are more

1:29.3

obtrusive than other animals, not less, and the same is true of cheetahs, butterflies, and Mexican

1:35.2

vine snakes. These and other methods of camouflage found in nature eventually found their way

1:41.3

to military applications, with perhaps the most famous examples

1:46.0

found in camouflage patterns worn by soldiers, the dark green patterns on their clothing, standing

1:52.0

out in civilian life or in the Arctic, but blending in amazingly well in forests and jungles.

2:00.0

But a less famous application is probably the most interesting,

2:03.3

though it utilizes very different patterns and colors than those generally found on individual soldiers.

2:09.6

During World War I, a zoologist named John Carr proposed that the British Navy make use of patterns

...

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