pattern

int size = 100;

void setup () {
    size (1280, 747);
    background (0);
    noStroke ();
    fill (255);

    int count = 0;
    for (int x = 0; x < width; x += size) {
        for (int y = (count % 2 == 0) ? 0 : size; y < height; y += size * 2)
            square (x, y, size);
        ++count;
    }
}