size(200, 200)
background(0)
box_size = 11
box_space = 12
margin = 7
# Draw gray boxes
for i in range(margin, HEIGHT-margin, box_space):
i += box_space/4
#print i
if box_size > 0:
for j in range(margin, WIDTH-margin, box_space):
j += box_space/4
fill(1)
oval(j-box_size/2, i-box_size/2, box_size, box_size)
box_size = box_size - 0.6