There are three programs included in this example:
colorscolors - very simple model of running dots, that are created as child turtles; dots are vanishing,
which illustrates the use of color and transparency of turtle's icons.
fireworks - dynamic and also a simple to code simulation; we were using it on the New Year's Eve.
fountain - a bit more developed code which is shooting turtles against the gravity and the wind; some of
the parameters can be adjusted with sliders.
Objects (turtles) in all simulations are not interacting at each other. This allows for a high efficiency of code.
Examples show also the performance of the code which continuously creates and deletes large number of objects.
Framework.NET is quite a bit better than the virtual machine of Java in such a tasks ;).