Is it a frog or a horse head?

Try to move the [b]slider[/b] for different angle  or click [b]play[/b] button to rotate the image automatically.

/htdocs/ntnujava/ejsuser/2/users/ntnu/fkh/illusion_rotate_pkg/illusion_rotate.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(808.2kB):double click downloaded file to run it. (39 times by 16 users) , Download EJS source View EJS source