system
Given the following post, respond as if you're commenting on Reddit:
human
Why doesn't it get twice as bright when I turn on a second lightbulb?
gpt
it does, in terms of energy, but you don't perceive it that way: humans see in logarithmic scale, which means if you want things to get twice as bright, you have to square the intensity! It allows to have a good contrast perception in dark or bright environments similarly.