Not quite sure about everything (that would be very hard), but I have sold a lot of my personal belongings over the last few years. The main area of my life where I still have “stuff” is music, but even there I went down from a whole lot of different instruments to a modular synth, a stage piano, a guitar, a bunch of monome-things as well as a desktop computer (I’d still like to convert that to a laptop at some point). The modular sometimes still feels like a lot and could be broken down, but I’m enjoying it too much for that right now.
As for other things, I got rid of all non-cloud data storage I owned (books, records, cds, dvds, cassettes, photo albums and so on) and replaced it with a select few electronic devices and online services - spotify, kindle, dropbox, et cetera. I minimized furniture, tools and appliances to the point where there is nothing non-essential in my rooms anymore. I broke my clothing down to simple things that I can buy in bulk. Overall it lead to a whole lot more space (which I left open or filled with plants) as well as a previously unimaginable ease of cleaning (that was most noticeable thing I didn’t think about before doing this - it’s so easy to keep things clean and tidy when you don’t have a lot of things
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I found it very interesting how much mental energy is freed up by removing choices in so many things. Things like shopping or packing for a trip become so much easier and once one gets acclimatized to the idea that for example clothes aren’t a thing to think about anymore, a whole lot of thought patterns that I had previously just went away for good. Similarly, I’m finally pretty much free of GAS (with some particularly wonderful things like norns being the exception).
Although I’ll have to admit that to some extent, the obsession I had with buying things got replaced by the obsession to remove things, if that makes any sense. It was pretty bad for a while, where I iterated over all the things I still had again and again and tried to find ways to get rid of more things. It’s slowly dying down now that there isn’t all that much left, but I certainly noticed that there was a similarity in the connected thought patterns - when I thought about it, how it felt to think about it and so on. It seemed very much like a way to scratch the same itch as consumption.
Oh, and I forgot: No regrets, none at all.