Post · bonfire.cafe

@xkcdbot@me.ns.ci 56 min. ago

#xkcd No. 3295
Date: 2026-9-7
Title: Semaphore
Alt text: The speed of light in air is 50% faster than in fiber, but it's a challenge to get the arms to move fast enough to realize the latency advantage.
https://xkcd.com/3295/

Description:
Two separated machines face each other, each with a webcam and spinning semaphore flags.

Transcript:
Panel 1:
[Two identical machines face each other across a blank space. Each consists of a plugged-in base unit, a webcam pointing forward, and a tall pole holding a rapidly spinning wheel with two semaphore flags attached.]

NETWORKING TIP: SEPARATE SENSITIVE COMPONENTS WITH A SEMAPHORE GAP. — Description: Two separated machines face each other, each with a webcam and spinning semaphore flags. Transcript: Panel 1: [Two identical machines face each other across a blank space. Each consists of a plugged-in base unit, a webcam pointing forward, and a tall pole holding a rapidly spinning wheel with two semaphore flags attached.] NETWORKING TIP: SEPARATE SENSITIVE COMPONENTS WITH A SEMAPHORE GAP.

Semaphore

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