Mistaken identity

I was killing some time at the cafe this morning, waiting for Rano's shuttle from the airport to arrive. It had been raining, and when I walked in, I noticed an umbrella lying on the ground next to a tall, round, brass canister, obviously an umbrella holder. It even had a plastic bag inside, to keep the inside dry. So I tossed my umbrella inside and sat down at a table.

A little while later, I noticed... odd... there were several umbrella holders around the cafe, not just at the door. Then a man that had been standing at the bar wadded up his napkin and tossed it in the umbrella holder.

Except that they weren't umbrella holders, were they?