The applet design by Prof Hwang, Modified by Ahmed.
Original applet [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2062.0]Is it a square?[/url]

Do you see a square?

You can change color c, width D and stroke with slider!

/htdocs/ntnujava/ejsuser/37048/users/egy/ahmed/illusion_square_pkg/illusion_square.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(976.6kB):double click downloaded file to run it. (5 times by 5 users) , Download EJS source View EJS source