The Re-echo Club: as by William Wordsworth (Purple Cow)

She dwelt among the untrodden ways
Beside the springs of Dee;
A Cow whom there were few to praise
And very few to see.
A violet by a mossy stone
Greeting the smiling East
Is not so purple, I must own,
As that erratic beast.
She lived unknown, that Cow, and so
I never chanced to see;
But if I had to be one, oh,
The difference to me!