Two Mat Area, Tsubo
The amount of dirt you need to get some peace is a two mat area. Two tatami mats, that is. Also called a tsubo, this is a pretty common measurement in Japan, so you should get really familiar with the amount of space that two tatami mats take up together.
Picture how big a two mat area is. Lie down and feel the peace this much space brings to you.
へい
つぼ
None
A two mat area also happens to be big enough to hold two bodies (つぼ). That's enough space to bring peace to two living, or dead, bodies!
Try to picture a two mat area with two bodies lying in it. Whether they're alive or dead is up to you.