The hallway in our flat has one of these setups where the lights can be turned on via any of multiple rocker switches. So I wanted to understand how that works, to be able to upgrade that light with a smart relay.

I also love explorables. One exciting thing about the rise of vibe coding is that the barrier to creating this kind of interactive teaching tool is going towards nil.

So here is a quick vibe coded applet showing how a traveler-wire setup works. This was originally a one-shot ChatGPT canvas project, which I then asked Claude to polish a bit.