Forget “museum rooms” we use twice a year (dining rooms and living rooms) and embrace convertible spaces that change with our whims.

Foldaway walls turn a private study into an easy-flow party space. Walls can consist of fancy, glass panels ($600 to $1,600 per linear ft., depending on the system); or they can be simple vinyl-covered accordions  ($1,230 for 7 ft. by 10 ft.). PortablePartions.com sells walls on wheels ($775 for approximately 7 ft. by 7 ft.).

A Murphy bed pulls down from an armoire-looking wall unit and turns any room into a guest room. Prices, including installation and cabinetry, range from $2,000 (twin with main cabinet) to more than $5,000 (California king with main and side units). Just search online for sellers.

And don’t forget area rugs that easily define, and redefine, open spaces.