With all due respect to the kitchen, we could make a strong case for the bathroom being the heart of the home. It’s the spot where you begin each morning and wind down at the end of every evening. And when you’re in need of a full recharge, there’s nothing quite like a long bath to wash away the stress of the day. The bathroom is vital to health and happiness, which is why it’s so important to create a space that goes beyond merely functional. A few thoughtful design choices—and some pieces from Duravit’s Zen-channeling Zencha collection—can take yours from the place where you shower and brush your teeth…