  A circle packing is a collection of disks with disjoint interiors in the
plane. It naturally defines a graph by tangency. It is shown that there exists
$p>0$ such that the following holds for every circle packing: If each disk is
retained with probability $p$ independently, then the probability that there is
a path of retained disks connecting the origin to infinity is zero. The
following conclusions are derived using results on circle packings of planar
graphs: (i) Site percolation with parameter $p$ has no infinite connected
component on recurrent simple plane triangulations, or on Benjamini--Schramm
limits of finite simple planar graphs. (ii) Site percolation with parameter
$1-p$ has an infinite connected component on transient simple plane
triangulations with bounded degree. These results lend support to recent
conjectures of Benjamini. Extensions to graphs formed from the packing of
shapes other than disks, in the plane and in higher dimensions, are presented.
Several conjectures and open questions are discussed.
