Answer:
I am partially baked. I am not completely lit. I am a portion of the moon. I am lesser than full wit. I am a divider of the hour. I am not a total lie. I am a sibling through one parent.
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 breaks when you say its name?
I don't have eyes, but once I did see. Once I had thoughts, but now I'm white and empty. What am I?
I mirror your actions.
The answer I give is yes, but what I mean is no. What was the question?