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by photon_off 5682 days ago
To dodge the question: I don't often find creativity to be the bottleneck of my output. Execution is what takes time.

To answer the question: Probably beliefs that act as rules. It's written somewhere in a PG essay that it's best to not know what is "impossible." To generalize, if I believe that Google owns search and it's not possible to enter that market, then I'll subconsciously prune any ideas stemming from "search".