wikistream is an experimental visualization of realtime edits in major language Wikipedias. Every time someone updates or creates a Wikipedia article you will see it ever so briefly in this list.
If someone uploads an image file to the Wikimedia Commons you should see the image background update. If you’d like to pause the display at any time just hit ‘p’. To continue scrolling hit ‘p’ again. If you hover over the link you should see the comment associated with the change.