The idea of stopping time was especially interesting in connection with the possibility of still moving things around with the mouse, doing avatar-changes and so on.

Because objects get rerendered with lower alpha-values at older positions it becomes sometimes hard to say what is "real" or just a blur. The blur is important because it shows you the way if you rewind time.

An old screenshot of Blumenmacht:
http://members.gamedev.net/urs/blumenmacht/History/history7.jpg