Throwaway TF idea or prompt: Someone gets transfigured (TF'd) into a Shopping mall / Supermarket, the size of at least a football(rugby) field to as large as SCP 3008
A trigger could involve winning a contest and getting invited to a factory, having some Willy Wonka type of stuff happen before a surprise experiment that leads to everything else
As to how the process would even occur, it could be a very heavily detailed transfiguration where the organs morph into appropriate parts of a mall or another thing (anything similar to a mall), maybe the brain turns into a huge supercomputer server or integrates as electronics (or a magical lifeforce) throughout the entire building [there's probably no way anyone would try and explore the mid-TF to immaculate detail]
It would also be interesting to explore how the person / other being turned mall would move around, maybe it would be like Howl's Moving Castle, and they have apt dexerity to view (with maybe security cameras or secret options like telekinesis) and interact with stuff or people within their body or building (using stuff that is part of them like wires, shelves, windows, or any other trinkets) and slightly outside of it
Maybe they could go on afterwards to explore the world and fight against corporate greed or become a benevolent god after experiencing huge gains in power and IQ from becoming a supercomputer / godlike eldritch being that may be able to somewhat warp reality along with space and time by creating anything the former person desires (very broken power(s) on its own and comparable to shapeshifting, that I decided this sapient shopping mall will have)
Inspiration was from a certain plural redditor who had a TF mood of becoming the AO3 website itself and idk what else
Tldr A situational where someone (could be you) turns into an eldritch creature, except it's a shopping mall and could somehow be a commentary on consumerism (I hope this is at least somewhat of a gem of a post for the SFW TF community)