I like this post on reading and memory from Horace Bianchon.

…the value of reading lies less in retention than in integration. A good book tweaks your internal models and you begin to see a familiar problem in a new frame. You revise the assumptions behind a mental shortcut or you absorb a phrase that becomes part of your vocabulary of thought.

I read for two reasons. First, it’s my favorite leisure activity, one of the only times I achieve the “flow state” that is the key to happiness in the moment for me. But second, yes, it is about tweaking my “internal mental model” of the world. Over time, that will change how I perceive and react to the world and the small and large decisions I make and ultimately how I live my life. I am a different person than I was 5 or 10 years ago, and I will be a different person 5 or 10 years from now (unless I’m dead), and that is largely from those tweaks to my mental model of the universe I am part of. Because that mental model of the universe IS the universe for me. We are each living side by side and interacting with each other within our unique mental models of the universe. Now, I would argue that for practical human purposes, we should assume that there IS such a thing as objective reality, even if we can’t measure or agree with perfect clarity on what it is. We can keep searching for it and approaching it, and some of our mental models are going to be a lot closer to the true reality than others.