A bar of soap worn to a coin

Roughly forty days is the average lifespan, measured across six households, from unwrapped rectangle to the thin, curved sliver that will not lather and will not be thrown away either. Somewhere around day thirty the bar stops being a bar and becomes a shape: an oval, then a lens, then something closer to a coin that has been in someone's pocket since an administration nobody can quite place. It develops a groove where the thumb goes. It picks up a faint grey cast that is not dirt, exactly, more a record of every hand that has passed through it. These late-stage specimens are more interesting than the fresh ones, which are, frankly, just soap. A new bar has ambition; it smells of whatever the box promised, eucalyptus, oatmeal, a beach nobody involved has visited. A worn bar has given all that up. It has been reduced to its single function and performs it anyway, slick and stubborn, sliding out of the hand at the exact moment it is needed most. There is a ritual, in most households, of pressing the last sliver onto the next new bar until the two fuse, a kind of soap succession that nobody teaches anyone and everyone independently invents. The practice turns up in household after household, unprompted: one of the last true folk customs left, unremarked, unrecorded, performed daily behind a closed shower door.

H. G. Plimsoll