When clients start remodeling, bigger is often the name of the game, especially when it comes to bathrooms. Not so for Lian Eoyang, of the San Francisco–based firm VIF Studio and her clients’ master bath in their expansive home outside Boston. Instead, she took a sprawling space, actually a his-and-hers set-up, and made it more intimate and user-friendly, swapping in a soothing palette of black, white and gray, along with equally quiet materials. Highlights include a two-person shower, a new closet for the toilet and a tub ringed with loose stones for a dramatic textural statement. We were so intrigued by this jewel box of a space, we asked Eoyang for more details, and she was happy to oblige.