system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What does "nose" smell like? How does your nose ignore itself to smell its surroundings?

Is it something that your brain does to not sense it, or does your nose or body produce something to mask the smell? Could we possibly smell other noses' scents? Is it the same for animals? Or is there even a smell in your nose?
gpt
Your brain only has the capacity to notice things that are changing in your environment.  Sensory inputs that remain constant (and are deemed not a threat or at least not a source of interest) are not given any attention by the brain.          
    
Your ears, eyes, and skin do the same thing.  Moments after you sit down you don't feel the chair on your ass anymore (until you think about it).  You didn't notice that the light bulb was buzzing until you turn the light off.  etc.