How do you explain dimensions greater than 3, to a 5 year old?

Enlighten the unenlightened here for a second...

Why would you even want to explain higher-order dimensions to a 5 year old?

I don't know all that many 5 year olds, in all honesty, but I don't know that I know ANY of them that I'd ever need to explain multi-dimensional space-time (or multi-dimensional mathematics, depending on what you want to call a "dimension").

C'mon, the kid's still very new to the world. They're barely comfortable with three dimensions at this point in their lives.

I understand that this question may have been posed simply as a rubber duck scenario, but even still, that'd be my first response.

What did the box look like before your brother jumped on it?

What did the box look like after your brother jumped on it?

(It's the same box, right?)