Prepositions (at)

Hello

I have a question

Grammar in Use says that we use At when want to talk about a point rather than an area

What does it mean??

What is the difference between
The ball is in the corner
The ball is at the corner

Thanks

Imagine this "L" is a corner.

This is at the corner L

L This is in the corner.

Did that make any sense? Any at all?

MaintiensLeDroit ,

It doesn't make any sense.

Ok. look at my last post, think of the L as not a letter but resresenting two walls, meeting to make a corner.

Think of a box. If you are next to a corner, inside the box, then you are in the corner. If you are next to a corner, outside the box, then you are at the corner.

Did that help any?

Yeah thanks..