^Extremely-long-and-official-sounding-topic-title-for-a-not-so-nearly-long-or-official-question!
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So I've been thinking. Read through Mistborn for a second time, and still unanswered. And as I've attempted to theory-craft a video game concept borrowing heavily from Brandon's concept (in Mistborn) of the Shards of Preservation and Ruin, it has caused me to question something fundamental.
Namely, the actual meaning behind their names. With Ruin, it's relatively easy; his name makes it clear he's out to "ruin" things (although I think the loose in-book definition of "intelligent decay/entropy" is more appropriate). He's a force of decomposition, de-organization, tearing things apart, breaking things down into their simpler, constituent parts.
However, (and this is where I run into problems), the same doesn't seem to be true for Preservation. Namely, that her his name doesn't indicate precisely what she he does (sorry, I recognize it's a guy (except for that bit with Vin), but "Preservation" has always sounded feminine to me...). To me, Preservation is akin to Conservation (of mass/energy, etc); you 'preserve' or 'conserve' or 'save' something, keep it in stasis, halt decay... and growth. Something that is Preserved can neither grow or die, it's stuck or frozen (for better or worse).
Thus, at best, even in a world without Ruin, under Preservation nothing would change (including creation); everything would just remain "in the same state in which it was after it was created" (= Garden of Eden). In a world with both Ruin & Preservation, you have "entropy whenever preservation slips up", essentially; still no creation.
So how does this "working together, Preservation and Ruin (with their powers combined) made mankind"-thing work? Moreover, how is Allomancy (a magic system which involves ever-used-and-disappearing stores of metal) related to Preservation; if anything, that's Ruin's field. (which lends well to the (completely-incorrect) thought of Feruchemistry <-> Preservation; think about it. You store an attribute, you tap it at varying intensities, but net overall gain/loss of a given attribute is nil. Very Preservation-y, if you ask me . But that's another argument.)
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TL;DR - How come Preservation can "make" things at all; shouldn't she be completely aligned with homogenousness (word?), conservation and homeostasis? And why isn't Feruchemistry linked with Preservation?