They can point to an empty chair.

Who is sitting in that empty chair?

One of the lies that we tell ourselves is that we're making progress; but Huey's chair's empty.

The most expensive piece of equipment we have in this dining room is an empty chair.

You get a kite, get it up in the air and then sit back in that chair, and your blood pressure will drop. It's a great way to relax.

There seems to be a trend among empty nesters toward selling the house in suburbia and moving to a remodeled or restored home in downtown areas.