Iteration with a "for" structure to construct repetitive forms.
num = 14
size(640, 360)
background(102)
noStroke()
# Draw gray bars
fill(255)
y = 60
for i in range(num / 3):
rect(50, y, 475, 10)
y += 20
# Gray bars
fill(51)
y = 40
for i in range(num):
rect(405, y, 30, 10)
y += 20
y = 50
for i in range(num):
rect(425, y, 30, 10)
y += 20
# Thin lines
y = 45
fill(0)
for i in range(num - 1):
rect(120, y, 40, 1)
y += 20