Noise cancelling headphones still have a residual noise, that you will hear, because our hearing has an incredible dynamic range. Adding a faint background noise of your choice, to cover that residual noise, is a good idea.
Then, these crafted noises do exist because of the exact nature of the life around you. For many people, the "life around you" is what they want to escape, exactly.
Then, these crafted noises do exist because of the exact nature of the life around you. For many people, the "life around you" is what they want to escape, exactly.