And drill down one more field.
But for this data, there's only one store in each postal code and in each city.
Watch the data in the table change to reflect the data being used to create the treemap.
Selecting the aquatics element would show you data for swimming, diving, and water polo.
If you see a combination of these drill controls at the top, your visual has a hierarchy.
Hover over a leaf to see even more detail.