Say a rectangular solid has length=1, width=3, and height=5. Its base area would be 1x3=3. Its volume would be 5x3.
Now, 5x3 means 3+3+3+3+3, and each 3 represents the area of a 2D plane. So does this mean that the solid is only made up of 5 2D planes, instead of an infinite amount?