I've been a lurker here up until now, but I just have to pipe up here and point out that in the "World Nature" part of the presentation the concept art seems to very deliberately include only the Land and the Seas pavilions, so I'd venture to assume the Imagination Pavilion is definitely not in World Nature.
Then again, it's not really mentioned or showed anywhere else, so maybe they just want to pretend it doesn't exist...like a figment...of our imaginations...
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I'll go back to lurking now, bye.