Answer:
I always have to work with something in my eye.
I am full of holes but still hold water. What am I?
Adored by few, feared and hated by many. Mistress of the entire universal reason, master in the art of numbers. Some may have solved many of my mysteries, but there are still many of them to find. What am I?
I have an eye but I cannot see. What am I?
I go up when the rain comes down. What am I?
Dark, feathery, and popular in Baltimore and fantasy books.