A writer's job is not complete without attention to precision. What you're trying to be precise about is your relationship to the observed thing. And "observed thing" could include remembered thing, fantasized thing, fictionalized thing, recorded thing, trans-altered thing. It's the model that's in front of you or in your brain or your memory or whatever. So you're trying to be precise about what it is you're seeing because it's very unlikely that you're going to be able to depict it as it is.