     # => 60
 
     # to see what they look like
-    for color, index in ['magenta', 'yellow']
+    for color, index in [magenta, yellow]
       canvas.drawRect
-        color: eval(color)
+        color: color
         x: 20 + (60 * index)
         y: 20 + (60 * index)
         width: 60

    darkGreen = green.darken(0.3)

    # to see what they look like
    for color, index in ['green', 'darkGreen']
      canvas.drawRect
        color: eval(color)
        x: 20 + (60 * index)
        y: 20 + (60 * index)
        width: 60

    desaturatedBlue = blue.desaturate(0.4)

    # to see what they look like
    for color, index in [blue, desaturatedBlue]
      canvas.drawRect
        color: color
        x: 20 + (60 * index)
        y: 20 + (60 * index)
        width: 60
