Porosity

The shift from her to I needs more distinction, I think -- the idea is clever but it's not clearly defined yet.  I'd say the best way to achieve this is with line breaks to make it more obviously deliberate, like:

he dropped her
on the rug, watching as I
puddled into two small mounds.
All that was left of me
now lay...

Also, I think you could probably just have "gray carpet", I'm not sure that "piece of" is required.  I'd also suggest a line break right at the end, putting "nothingness" or even "into nothingness" on a separate line.   I do think it's only that last stanza that needs attention, because the first couple set it up beautifully and the idea itself is outstanding.