Apples in the Rain

It was a chilly, rainy day when I saw this beautiful apple growing on a tree.  

The rain was dripping off the fruit. It was a picture asking to be taken.
I was surprised to see the large apples shared the tree with a lot 
of much smaller fruit. I looked but could not find a second tree. 

I can only assume that a cutting of the one type of apple 

was grafted onto a tree of a different type, though same species.

Really, I have no idea other than that.