Flexibility is an increasingly important concept, and Marcus Hiles notes that homes are now being built with open floor plans and adaptable rooms easily adjusted to accommodate new arrivals for growing families. The concept of implied spaces, areas of the home identified by different materials or colors found in ceilings or floors, is a contemporary way to make interiors appear more spacious while avoiding traditional obstructions like multiple walls. Breaking through barriers is what cutting-edge residential design is all about: large windows allowing for extra natural light and replacing walls outright and helping to blend the indoors with the outside world. In line with making homes more desirable places to be, hot tubs, fitness areas and spas have been appearing in private residences more frequently, making relaxation and fitness a breeze. With the popularity of cooking gourmet-worthy meals, kitchens with restaurant-grade appliances and furniture like islands are being allotted additional overall square footage, and become the social center of the house, overtaking dining and living rooms as the place families come together.