I love how LEDs can flicker extremely quickly. Back in the early 90s when I was working on HIPPI[1] network hardware, our crossbar switch had a 7-segment LED display on each port that indicated the current destination. These LEDs were actually updated synchronously. which worked surprisingly well as a debug tool. You could send to multiple ports and see the port numbers blended on top of each other in proportion to each ports data rate.<p>Years later, it seems blinkenlights[2] went out of fashion and everybody started quantizing blink rates to 1s or 0.5s max. &#x2F;sigh&#x2F; it&#x27;s throwing out useful information for no good reason.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;HIPPI" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;HIPPI</a><p>[2] <a href="http:&#x2F;&#x2F;www.catb.org&#x2F;jargon&#x2F;html&#x2F;B&#x2F;blinkenlights.html" rel="nofollow">http:&#x2F;&#x2F;www.catb.org&#x2F;jargon&#x2F;html&#x2F;B&#x2F;blinkenlights.html</a>