This example creates variables for colors that may be referred to in the program by a name, rather than a number.
size(640, 360)
noStroke()
background(51, 0, 0)
inside = color(204, 102, 0)
middle = color(204, 153, 0)
outside = color(153, 51, 0)
# These statements are equivalent to the statements above.
# Programmers may use the format they prefer.
#inside = 0xCC6600
#middle = 0xCC9900
#outside = 0x993300
pushMatrix()
translate(80, 80)
fill(outside)
rect(0, 0, 200, 200)
fill(middle)
rect(40, 60, 120, 120)
fill(inside)
rect(60, 90, 80, 80)
popMatrix()
pushMatrix()
translate(360, 80)
fill(inside)
rect(0, 0, 200, 200)
fill(outside)
rect(40, 60, 120, 120)
fill(middle)
rect(60, 90, 80, 80)
popMatrix()