My ideas
modern sliding doors
More sliding doors. potentially way to create optional separation
"beams are nice" says Alice
like recessed lighting and sliding doors
panelling?
nice simple sofa
screen or projector...if screen, some shelving all around would be good
Could divide just with furniture, nothing built - means area by stairs could be gym, or pool, or opened to accomodate epic sleepover...more easily flex
Doesn't have to be so explicitly a desk
Separation wall could have built in desk
Hidden room! That will be cheap, I'm sure
Q