If I should find a single aspect they share, quality. They are not luxurous but built from quiality materials. I hate to waste and throw stuff away. I hate overpackaging and am 1000000% for environmentally-friendly stuff. But other that than, nothing. Not must have from their time, not even from the same centuries, no shared aesthetic aspects. I won't say that I adopted them, but this is not entirely false either.
I feel things, deeply just like I do not listen to music .. I feel the music. Call me a weirdo, that's what society think of me, but I do not really care. All those things I like already had at least one life before me, they aren't expensive or over designed stuff. Just simple, repurposed items that continue to live through me.
I think that the best design is something the designer designed with him(her)self in mind, with all his/her soul poured into it. People will like it or not, but that's not whats important. It will be unique, full of feelings and emotions .. and a maybe a commercial failure, but I don't really care about that
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Also, keep in mind that each person is unique and have his/her way to think/feel. People who really know me know how I do not like this tendancy society has to fit everything into a drawer with a label on it. I hear and respect your opinion but nothing irritates me more than someone trying to force his/her opinion on me. I do not care about society nor codes/atavism nor aesthetic, I only follow my heart and what it dictates to me.