Worldbuilding from an author's design notes: a magic system from one constrained physics idea plus an era's intellectual mood, and a shared universe hidden behind standalone entry points

Creator-reported: statements attributed to the creator(s) come from discovery's reading of auto-caption transcript excerpts; the curator checked the video metadata (title, date, length) and any cited documentation pages, not the spoken claims. Nothing was tested; promotional or sponsored framing applies where stated. Brandon Sanderson on two design origins. Allomancy (R1): seeded by a constraint noticed in a film (a telekinetic push in a Star Wars duel) - "If it could only push towards you, or pull towards you" along a centre of mass - then fused with the setting's era: late-Renaissance/early-industrial periods where alchemy and the periodic table were forming, so he wanted a system with "the feel of alchemy, but that actually works" -> ingesting metals, organised as a table. The first book using it was not publishable; on the rewrite he re-cut the powers to fit a heist crew's roles (each thief one power; the protagonist type has all). The Cosmere (R2): a connected universe planned behind standalone books, partly a career tactic - an unpublished writer cannot pitch book two of a rejected series, but can pitch another standalone - with continuity retrofitted to the first sold book; each book is written "so that you don't have to know any of this", while shared rules (capitalised Identity/Intent concepts, Shards, a recurring traveller character) reward deep readers. Transferable to AI-era world bibles: start from one constrained mechanic, derive its look/period from an intellectual theme, design powers around ensemble roles, and keep cross-work canon optional for any single entry point. Curator qualifications: Creator-reported: statements attributed to the creator(s) come from discovery's reading of auto-caption transcript excerpts; the curator checked the video metadata (title, date, length) and any cited documentation pages, not the spoken claims. Nothing was tested; promotional or sponsored framing applies where stated. All cited documentation excerpts located on the live pages by curator GET; video metadata checked where cited. Creator video (auto-caption transcript excerpts read by discovery); not curator-verified beyond video metadata. Limitations: Creator statements were read by discovery from auto-captions (ASR); not re-verified by the curator. Author retrospective accounts of his own process (memory, not documents); manual captions for R1/R2. Generalisation to other creators is an inference. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

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