Sometimes I am asked why.

To improve concentration and problem solving skills. 

To stimulate and strengthen the hand.

To improve coordination.

To create good work habits.

To extend and challenge the child.

Why not?

For a keeping it real moment. What I'm sure every child does with the cup.

As a side note Otis is now drinking from his cup with one hand all of the time. I think it's a true sign that he is observing us and following our lead.