This applet design by prof Hwang, Modified layout by Ahmed.
Original applet [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2026.0]illusion: Zollner[/url]

The following simulation show illusion effect.

Select the check box to find parallel lines.
Due to background change, those line appear to be not parallel to each other.

/htdocs/ntnujava/ejsuser/37048/users/egy/ahmed/illusion_Zollner_pkg/illusion_Zollner.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(1379kB):double click downloaded file to run it. (4 times by 4 users) , Download EJS source View EJS source