Festive Bokeh

Another arty shot of the Christmas tree before it comes down. Taken from almost the same place in the room as this one yesterday. I do like the way the circles give a hint of the tree shape.

In large, I can see marks on the circles and wonder if this is dirt on the sensor - any thoughts from those "in the know"?

Trying very hard to do some clearing up around the house before the return to work on Wednesday. We have started ....