i'll often pick the next book to read just because it gives off a certain ~vibe~ or ive encountered a certain mood or aesthetic i want to immerse myself in more so... 
this is mostly to collect as many books as possible for a certain vibe tm but also to work through your TBR by maybe making you pick something very different from the last one
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my notes on the prompts are just suggestions – if it fits for you, it fits for you!