Certain time of the day

When you are all alone, and can not see;
You are just as blind as me. 
You can't see your hand in front of your face;
For we both have the same hiding place. 

You can't  take a step and be free;
I think not: you are connected to me. 
You go where ever I may roam;
A single life that we both own. 

Their is only one time that we can not be;
Is when the sun don't shine on me. 
You are my follower as I lead the way;
Only to have you; certain parts of the days. 

I make a game, and try to enlarge you;
I can position myself; just look you grew. 
I can hide you in front of a tree;
No matter what you will always be me;

I love it when you walk with me;
Only if you knew what it's like to see me. 
I think it would be fun; although...
If you couldn't  you wouldn't be my shadow!