Here’s the premise: You have a comfortable, but not grandiose, house/condo/ apartment. And, yes, you have regular 8-foot ceilings — when most new construction seems to be going 9 feet or higher. And most furniture in stores today (even the mattresses) seems to be going the same voluminous route. How do you decorate without overpowering? How do you make your spaces feel bigger and taller?