As humans, we get used to things. Something that is new and incredibly exciting can become boring. This tendency to have decreased responsiveness to something is $.$ For example, there may be a painting or picture you really like so you put it on the wall in your room. You see this picture every day, $10$ times a day. Over time and repeated exposures to this picture you might start feeling like you've "seen it a million times" and it just doesn't have the same effect on you that it used to$.$

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