I saw this in the New Yorker RSS feed:

A Measuring Worm

by Richard Wilbur February 11, 2008

This yellow striped green

Caterpillar, climbing up

The steep window screen,

Constantly (for lack

Of a full set of legs) keeps

Humping up his back.

It’s as if he sent

By a sort of semaphore

Dark omegas meant

To warn of Last Things.

Although he doesn’t know it,

He will soon have wings,

And I, too, don’t know

Toward what undreamt condition

Inch by inch I go.