Last week, in my post on Vizcaya's bayside facade, I mentioned the pool which ingeniusly slips into the house for access and shelter.The Swan was kind enough to remind us that the pool's grotto has a ceiling which was painted by the artist Robert Winthrop Chanler.Chanler, like others involved with the project, received his education at the Ecole des Beaux-Arts in Paris. Deering hired him to work on an 'under sea' fantasy fresco to decorate the interior of the pool grotto. The exterior access…