The prototype of Zen Zoom. Made on ubuntu, I guess.
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varying vec4 color;
uniform int steps;
void main( void ) {
gl_FragColor.rgb = sin(3.0*sin(normalize(color.rgb) + vec3(steps)*vec3(0.01, 0.017, 0.0093)))*0.5+0.5;
gl_FragColor.rgb *= 0.05;
gl_FragColor.a = 1.0;
}