The Re-echo Club: as by Bliss Carman

Now the joys of the road are chiefly these,
A Purple Cow that no one sees,
A grove of green and a sky of blue,
And never a hope that cow to view.
But a firm conviction deep in me
That cow I would rather be than see.
Though, alack-a-day, there be times enow,
When I see pink snakes and a Purple Cow.