Disappearing Lines

Drag the left piece of the rectangle up and to the right along the diagonal. Make eyes open. What happened?

This applet requires Sun's Java VM 2 which your browser may perceive as a popup. Which it is not. If you want to see the applet work, visit Sun's website at http://www.java.com/en/download/index.jsp, download and install Java VM and enjoy the applet.

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