I try and keep my material valuables down to an absolute minimal, and so I've been able to keep books fairly low... I indicated 250-500, but that's not true anymore. I just sold several, several boxes of books to my local half-price books a couple months ago, keeping only the ones most important to me.
Where I currently live, there is a small library available to me. Still, I have acquired another 50 lbs of books already, and am wondering even now how I will handle bringing them/parting with them when I leave the country.
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Thinking for yourself instead of being influence by an author? This is terribly naive. I am inherently of the same mindset, the "Beautiful Mind" concept of not wanting to taint your ability for original thought by being influenced by others. (I remember even thinking this way as a child.)
But in reality, except for fringe abstract fields, reading and studying others' work in any field allows you to come up to their level so that you can eventually move beyond it. You handicap yourself by not informing yourself as much as possible. INTPs thrive on masses of information, and make beautiful, original connections between new data when they are performing well... So inform yourself, and get some good books.
Video games, at their (quite rare) very best, are as good as a good movie. You speak in theoretically generous terms when you speak of video games demanding a moral response to the desire for success... the thing is, there's no real consequence in video games. At worst, it desensitizes the player. I've never become a fraction as attached to a video game character as I have a character in a novel. While it sounds in theory like actual involvement would help that, in reality, playing a video games makes me unable to take the characters themselves seriously. There isn't the suspension of disbelief that one experiences in a movie or book, because you are too consciously involved in the process of playing.
You also neglect that video games lack the poetic element of high quality writing. Prose can be used to awe and arouse a sense of majesty and depth that I've never seen touched in a video game...
And the richness of reading from authors of different time periods, with different styles. The idea of playing different 'genres' of video games doesn't begin to match the significance of the diversity within the realm of books.
As far as art forms go, Video games cannot compare--at least not present day, for sure, and even if some beautiful game has passed me that I would compare to a fine book in quality, it is obviously a much more rare occurrence than an intellectually/emotionally engaging book.
I still remember the beauty of playing Ico, but really... there was no depth to it, just abstract mystery and landscape. Thinking back on this, perhaps books require too much power of imagination for most people to properly appreciate?
K