Answer:
Without a bridle, or a saddle, across a thing I ride a-straddle. And those I ride, by help of me, though almost blind, are made to see. What am I?
What has feet and legs, and nothing else?
I rise and fall no matter what, only at finals rest do I not budge. What am I?
Lighter than what I am made of. More of me is hidden than seen. What am I?
I have six faces but not even one body connected 21 eyes in total but cannot see.
Give it food and it will live, give it water and it will die.