I still say that a box is one of the MOST important elements in early childhood learning. Not only does it promote large motor development, it presents so many additional learning opportunities. 
Mr. L is 11 1/2 months old.
This is a few pictures in a single day.
Sometimes he just likes to hang out like this. 
- Analysis
 - Logic/Reasoning
 - Handling Frustration
 - Thinking Outside of the Box [lol]
 - Perseverance
 
It's easier to get in on the low side. 
He's learning that.
Rocking a little too hard while sitting inside.
- Dramatic Play
 - Imaginative Resourcing
 
Sitting, hiding. Popping up and down.
- Positional Location
 - Climbing Coordination
 - Volume and Measure
 - Height and Depth Assessment
 
Climbing and surfing, sitting and laying on top. 
He hasn't gotten the nerve to stand on top yet. 
I'm waiting.
Notice the dinosaur hidden inside.
"[L]! Are you ON your box?
Where's your dino? Is it INSIDE your box?" 
- Force
 - Offsetting Forces
 - Work
 - Coordination
 - Balance
 - Strength Training
 
Carrying it all over.
Pretty heavy box for such a little guy.
That doesn't hinder him in ANY way.
- Physics
 
Putting it off-balance so that he can rock it like a maniac.
But yes, it's all gross motor. 
And tiring.
Tags: box, gross motor, boy, girl, infant, toddler, daycare, child care, learning, education, homeschool, early childhood education, ECE, DAP, Reggio