On each figure a yellow colored text shows the objects you can modify.
There are in the toolbar two tools "Animation" and "Multiple Animation", witch allow you to animate with "springs".
Click on this icon to test 
Java applets are interactives too.
The applet becomes dynamic once it is swept by the pointer
A click on the applet freezes it. A further click re-starts it.
A double click causes a re-initialisation, as well as the appearance of a toolbar, the roles of each being indicated by the bubbles. Thus the springs can be changed, and the figure downloaded etc.
Click on this icon to test : 
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