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Our brain is designed to be keenly aware of changes. Smart product designers are well aware of this tendency. They make sure that, when products require users to pay attention, something changes. Warning lights blink on and off because we would tune out a light that was constantly on. Old emergency sirens wailed in a two-note pattern, but modern sirens wail in a more complex pattern that’s even more attention-grabbing. Car alarms make diabolical use of our change sensitivity.