Answer:
Although it sounds like I work on a transportation device I actually work in a restaurant.
I start in little but I end in full you'll find me in half and complete.
What has one eye but cannot see?
I am in the middle of water but am not an island.
My keepers feed me colored balls. With sticks they store on my den walls. Sometimes I store them in my pouch. Sometimes deep in my belly; ouch!
What made Cyclops quit teaching?