Perfect town rating question

[roseflower]

How many items can you can leave on the ground before it affects your town rating? I keep seeing the limit is 10 or 15 items, when I look it up, but does anyone know for sure?
And what items do not affect your town rating, is it true that all "unplaced" items count as litter, even the materials you can collect and are stackable, like wood, twigs, pearls, star fragments, bamboo sprouts, snowflakes and little rocks?

 

[Rosch]

Having 15 or more dropped items on the ground will cap star rating at 4.
Placing more than 45 items in a 8x8 area will cap star rating at 4.
Placing more than 6 of the same exact items in a 8x8 area will incur a point penalty.

Dropped items will not affect your island rating score: tree branches, stones, sea shells, star fragments, mushrooms, and message bottles. Items dropped on a surface (such as tables) will also not incur a penalty.

For a more detailed info on ratings, check this out:

Island Rating

Fan-made FAQ for AC:NH.

chibisnorlax.github.io