In text mode, a pile of items indicates there are more items under the top one by changing the background color.
I understand it is impractical to draw every item in view (especially with up to 4096 items per tile!), so I would like to see a “more” or “pile” tile definition added that does the same thing for tile mode. The “more” tile would display underneath the icon for the top item on the stack and let me know at a glance where piles of loot are.