Superfluidity
When helium atoms look like particles, the integrity
of each is enclosed, is held in, so that
as they bounce off each other
you can, in principle, track them,
and so judge which was which. You can
tell which brought what to the interaction;
which was the gainer, which the loser. If you
cool them down then atoms start
to behave more like waves.
The integrity of each is preserved but extended,
so that when they meet they overlap
and you cannot, even in principle,
track them and judge which was which. There is
no meaning to the question "which
gained and which lost?" There is only
the meeting. For a moment each is itself and the other.
When the heat is low enough the viscosity
suddenly plummets to zero.
In a congregation which is all meeting,
a magical, impossible fluidity results.
But it is not impossible. It is possible.
Copyright Credit: Andrew Steane, "Superfluidity"
published in Theology, Volume 124, Issue 6
https://doi.org/10.1177/0040571X211056797