This came from an Italian website dedicated to the Ambrosian (Milanese) Latin Rite. I had no idea what it was all about so I enquired over at Catholic Answers Forums.
I am told: The flaming ball is lit during the feast of the patron saint and martyr. It is called ‘il faro” (the lighthouse???) It is a globe covered with a cotton fibers (decorated with cross, palms, and crown) and it is hung at the entrance of the presbiterium. It is the symbol of the life consumed by the love of Christ at the moment of martyrdom.

August 4, 2007 at 11:35 pm
This photograph is absolutely spectacular. I’ve never seen anything quite like it - the closest thing I can imagine is the botafumeiro of the cathedral at Santiago de Compostela.
What was the blog/site you found this photo on? I’d love to check that out!
August 14, 2007 at 4:11 pm
Hmmm. How is your Italian?
http://www.cattoliciromani.com/forum/showthread.php?t=187
It is from an Italian forum. I got the information about the photo - after finding it there - on Catholic Answers Forums - where someone with experience was kind enough to translate/offer explination.