So, that's quite a bit of growth in 4 days. The amazing thing is that you can almost just sit and watch this thing grow. I'm going to take another picture of it tonight, say around 9pm. That will give this little plant 12 hours to do its thing. Trust me, you'll be in awe.
EDIT: Okay, here are the before and after pictures. Click on the pic for a larger view.
Pretty crazy, huh?