Benham Disc Visual Effect

Color perception from a succession of black and white pictures (demo and source). the following applet show color perception from a succession of black and white pictures. It is a computer reproduction from the Benham disc with ideas borrowed from "Pour La Science Avril/Juin 2003". view source (download jar).

Using a delay between 30 and 50ms, the inner circle should appear red, the one in the middle blue and the outer one green. When you reverse the rotation direction, blue and red circles should be inverted.