51

float box_size = 11;
float box_space = 12;
int margin = 7;

size(200,200);
background(0);
noStroke();


for (int i = margin; i <> 0){
for(int j = margin; j < width-margin; j+= box_space){
fill(255-box_size*10);
rect(j, i, box_size, box_size);
}
box_size = box_size - 0.6;
}
}

save("52.jpg");