The pattern is generated with the following code:
//Attractors
float a = 2.25;
//Initial values
float x = 1;
float y = 1;
void setup() {
frameRate(60);
size(800,600);
colorMode(RGB, 255, 255, 255);
background(0);
stroke(255, 255, 255);
strokeWeight(0.125);
}
void draw() {
float dx = (x + y + a * cos(TAU * y)) % 1;
float dy = (x + 2 * y) % 1;
x = dx;
y = dy;
translate(width / 2, height / 2);
point(x * 96, y * 96);
}
It creates the following image: