Answer:
I sit in a corner while travelling around the world.
Brown I am and much admired. Many horses have I tried. Tire a horse and worry a man, tell me this riddle if you can. What am I?
I pass before the sun, yet make no shadow. I'm all around you, but you cannot see me. What am I?
I am a small paradise surrounded by dryness and heat.
I am rarely touched but often held. If you are smart you'll use me well. What am I?
As round as an apple. As deep as a cup. All the king's horses can't pull it up.