Nature often seems like an idea that has had its day.

You are so tactful that I have no idea what you want.

Moo may represent an idea, but only the cow knows.

Thrift is an attractive idea until you get down to specifics.

Stated clearly enough, an idea may cancel itself out.

A real idea keeps changing and appears in many places.

The lover as baby is a less troubling idea than the baby as lover.