Take a cue from the experts of small living during this smallest coolest apartment month. Tatami mats are like a building block of Japanese domestic interiors. Their dimensions (roughly a 2:1 proportion) drive the size, proportion, and layout of space in traditional residential Japanese architecture.   The mats are aromatic, resilient, and add warmth underfoot. Some places to look:  a tatami mat conversion calculator Tatami Room Chopa