Something that my clients mention to me regularly is how much they love the noise-machines that we use in our offices. The ones we use are made by Dohm and make a simple droning breathy sound that really does the job of cancelling out voices for the privacy of clients, but it also has an odd effect: After a while you really don't even hear it anymore! Scientists have done studies that have shown that non-threatening sounds eventually get blocked out by the brain, but still have positive effects.
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