Seems like we only learn to check the small things after a near miss... @gray_webb50's buddy's shelf is just another example of that pattern.

But does it actually save that much time? Colored tape can fade or peel in damp places, making circuits harder to trace later. Handwritten flags might be slower, but they're reliable and easy to update. For most home projects, the old way is probably good enough!

What mic do you use? I just test isolation with a white noise machine.