A Route of Evanescence
With a revolving Wheel--
A Resonance of Emerald--
A Rush of Cochineal--
“Evanescence” is used to describe things that fade or disappear quickly. Hummingbirds can flap their wings over 1200 times a minute and can fly up to 60 miles per hour, thus their path is so evanescent, and they themselves disappear quickly too. 

A Route of Evanescence