I don't know about you but when the coaster craze started, I and my family were gobbling them up.
It seems the restaurants figured us out and changed the coasters to the round ones.
What were we suppose to do with these beside a round book. Well here's one way.
The word window actually punches thru these coasters, and the two upper pieces fit into it.
There are glass pebbles on the bottom to raise it up.