I see where the cone gets it name but I haven't quite figured out the Christmas Tree part. This is a combination of 18, 10 minute exposures in each Red, Green, and Blue or 540 minutes (yes, 9 hours )of exposure. This was taken over several nights last week. This was my first image that used calibrated RGB based on white balance from 3 equal exposures of a G2 class (white) star directly overhead. Here is a JPG from the original.