I'm often amused with the way light bounces off buildings, creating interesting light effects. When you're surrounded by glass encased towers, there's always something to see. If you stroll south on University Ave, neal Adelaide, look to the west side. If you are there in the early afternoon, you should be able to catch the spotted building:
The spots are quite bright and visible, hard to miss. This photo hasn't been retouched, just cropped a bit. Depending on when you see them, the shapes morph a bit and shift along the building. Grab a coffee and watch.