Take some legos and build a tiny cube, let’s say four of the four by two bricks.
Now you want to make another cube that is twice as big in every direction.
To make it twice as long you need to double the amount of bricks you use, so 8.
To make it twice as wide you need to double the amount again, so 16.
To make it twice as tall you need to double it a third time, so 32 bricks.
The outside didn’t increase nearly as much though because most of those new bricks are on the inside.
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