Laser Christmas Tree

I am really lacking inspiration at the moment, so this evening I had a go at recreating an image I spotted on the RPS website.  I set the camera on a tripod, pointing at a (near) white wall.  With the room lights off and the shutter open, I then "drew" a picture on the wall with a laser pointer.  It took a few attempts to get a reasonable result (pretty difficult to see what you're doing in the dark) and this will have to do for today's blip.