Why only programmers? This applies to anyone wearing headphones or anyone talking to someone who is wearing headphones.
This is a post about headphones.
That's one way to look at it.
It doesn't apply to people who aren't engaged in work that is creative or intellectually challenging that requires getting into a deep flow. I've tried explaining to a manager that a regular mid morning or mid afternoon meeting breaks up the day too much and doesn't allow for necessary extended coding periods. He really thought it was ridiculous that I couldn't get straight back into deep concentration. If you've never had to do it you don't get it.
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