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Sunroom/Atrium. I see this scaled down to a Large bedroom size in an upper corner of the house where three sides and roof are windows. Then, a large shallow tub or two long slender ones could be installed and connected to the plumbing that would allow you to then plant and water plants. Just add coffee station, book shelf, and seating.
A company called Blandito has designed a circular, foldable pillow that can be manipulated into many shapes (bed, chair, cubbies of different kinds.) Extra larges for adults as well as children's size. I can see this being great biofeedback for sensory averse/craving children. Too bad it's still in the design phase!