I don't really get a lot of collecting- some of it is definitely hoarding, I guess. My father refuses to get rid of any manuals, even if he doesn't own the product anymore. Back in my parents house, the crawlspace was full of boxes of useless manuals, magazines, etc, that he just won't get rid of. I don't think I've ever been big on collecting things. I tend to go through my possessions at least once a year and throw tons of stuff out or donate it. But I guess I do collect books, but I reread most of them, or at least parts. I am willing to part with books though and I tend to get rid of some by donating to libraries or other places when I start running out of space. I also used to collect guitars, but I've never really been rich so that didn't get past 10 guitars (and nothing really that expensive), and I sold off 8 of them before I moved out, along with almost all the equipment I had collected over the years, except for an amp and a multi-effects pedal.
But I know how you feel about clutter, it drives me insane, if something isn't functional. I organize my things meticulously. My girlfriend doesn't share that with me, but I have learned that it isn't really worth getting stressed over. If I lived alone, I doubt any surface of my apartment would have anything on it that didn't serve some purpose- otherwise, absolutely bare. Easier to dust that way, too
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Opportunities multiply as they are seized. -Sun Tzu
Nature creates few men brave, industry and training makes many -Machiavelli
You can safely assume that you've created God in your own image when it turns out that God hates all the same people you do