Why are Butterflies so Beautiful?

From the drab green-brown worm of caterpillars and pupae, Emerges the phosphorescent butterfly so pleasing to the eye! But, why oh why, are butterflies so superbly colorful, That we admire the fleeting flutters and flashes as wonderful? Is it to say: "Be warned I'm toxic don't you dare eat me!" Is it to attract a mate or mimic leaves, or flowers, Tweedledum dee? For the worm which once crawled on leaves with heavy down-trod tread, Knew what splendor with patience lay within to burst out ahead. Like the ugly duckling shun by clutch contentious, and mum, That transforms to a magnificent white swan glistening in the sun! Alice said: "When you have to turn into a chrysalis and butterfly on queue, I should think you’ll feel it a little 'strange', I would, won’t you?”. “Not a bit,” said the Caterpillar, with a leer and sneer for all to hear. "You'll get used to it in time,” as it sucked its hookah into gear.