Here is a video posted on the youtube which I used.
http://www.youtube.com/watch?v=6x5FZ4l5m-Y&NR=1
If you observe the rectangle and the red marks. There is no change in the height. its just an optical illusion. Here is another one...
Sunday, June 22, 2008
Wednesday, March 5, 2008
Subscribe to:
Posts (Atom)