1.   But money itself is a slippery concept, clouded in priestly mystery.

2.   But in this show, as in a great deal of art nowadays, the higher truth seems to be that truth itself is a perilously slippery concept.

3.   Still, contemporary art can be a slippery concept for patrons accustomed to theater and dance.

4.   The value of sacrifice for peace in Somalia is a slippery concept, even if the US intervention there had not ended so inconclusively.

5.   There is no reason to expect that our linguistic toolkits will contain tweezers fine enough to grasp the slippery concepts that hold in the subatomic realm.