You lot are excellent. We are having every one of these rooms in our mansion.
@JoJoSM2 Definitely a pool. Can we have an outdoor one too? I love swimming in a warm pool while snow falls onto the water. (Natural thermal springs. Very eco. And we can have @Lineintime's mosaic tiled bed things dotted all around.
@ILoveAnOwl - The harpsichord is a wonderful touch. No music room should be without one.
Not just a slide into the pool either but i think we need a slide from the upper stories into the lower stories too. And one that gets you from the attic to the garden. And maybe a zipwire from the tower to the bottom of the garden.
@safariboot - an Observatory - definitely! And let's have a camera obscura too, in a dome shaped tower next to the observatory dome.
@isseywith4vampirecats and @Doobigetta - can we combine libraries? Wood pannelled, double height (with those sliding ladders and maybe a gallery) oriental rugs, glowing fireplaces and a chandelier.
Paddock of shetland ponies is essential.
@HigherFurtherFasterBaby - do you need a perfect white modern lab or can it be a wood pannelled one bubbling wth copper cauldroms and winding glass cooling pipes and jewel bright potions that make us all slender geniuses of infinite energy and grace?
@BrieAndChilli If we are having a gift wrap room, can we also have a floristry room wher flowers are cut and arranged and crystal and orcelain vases glint? And I have to confess, we actually have a Lego room. It;s the spare bedroom really but it got so much Lego stored and built and played with in it that it became nown as the Lego Room.