This applet design by prof Hwang, i just modified layout.
Original applet [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2030.0]illusion_ponzo effect[/url]

Are those two yellow bars the same width?

You can drag more from the top one (Up to 10 bars).

/htdocs/ntnujava/ejsuser/37048/users/egy/ahmed/illusion_ponzo2_pkg/illusion_ponzo2.propertiesFull screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
Download EJS jar file(713.5kB):double click downloaded file to run it. (4 times by 4 users) , Download EJS source View EJS source