Answer:
My love, when I gaze on thy beautiful face. Careering along, yet always in place, the thought has often come into my mind. If I ever shall see thy glorious behind.
How far will a blind dog walk into a forest?
It holds most knowledge that has ever been said. But is not the brain, is not the head. To feathers and their masters, it's both bane and boonÂ…One empty, and one full.
Just head and foot yet never tires of dancing.
What is up that’s also down? What’s a smile and a frown?
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?