soap lies on the scales
the dial of the scale is set to zero
when the viewer is nearby - water drips from above the soap is washed
its weight is reduced
the arrow moves to a negative value the value of the art object increases with the movement of the arrow
valuable is what is not
In the 20th century the Black Square of Mlevich proved that the picture may be the absence of a picture.
Then the Duchamp fountain proved that a sculpture may be an object not related to art.
Antimatter proves that in art, an object that is virtually absent can be valuable.