True, but at the same time it also feels like it could've once been an actual art gallery, the barricades around the edges reminds me of the way they set it up so people don't touch art pieces and having a raised platform in the center would theoretically give you an excellent view of the art...
Judging by the fact we don't see any other poe in the game (possibly the series) that are not only named but have the portrait skill i'd say it was once their mansion and after death haunted it instead, possibly they were minor royalty in hyrule, though chances are the portraiture manipulation...
I don't really see the Forest Temple as having a connection to the mask salesman, the place was inhabited, most likely by the poe sisters, or possibly the royal family in times gone past.
I'd assume the reason that Termina's Time doesn't affect him is for 2 reasons:
1)Time doesn't exist for...