This was an interesting challenge, I even brought out the dictionary to clarify the definition of the word Circle. It didn't really help that much. Here's something to ponder on though....did you know that a circle is not necessarily round.....look it up in the Webster's Dictionary that is the conclusion one arrives at.....you learn something new everyday...or am I the only one that thought a circle is round. Anyhow that would be enough of that, back to the challenge.
This first pic is a bit of detail on my sideboard.
The next few pics are light fixtures found around the house. The first one is in the living room.