Koch Curve fractal

The Sieve of Eratosthenes

movements and animation coordinated with sounds

One way to create the clock face.

Draw an ellipse with differential

A visual illustration of Fourier series for sawtooth waves

an n-body simulation

Waveplace St John Pilot

Etoys objects can "talk" to each other. If you look at the script "simpleSteering", you see that the car is turning by the wheel's heading.