What questions could you ask that would tell them apart?

Does it have large dimples?

Does it have pointed ends?

Is it white?

Has it got white lacing?

All of these questions give a
YES or NO
answer

and
allow you to sort these two items.

 

This is what Branching Databases are all about.

Does it have large dimples? YES - It's a golf ball.

Does it have large dimples? NO - it's an American football.

 

Does it have pointed ends? YES - it's an American Football.

Does it have pointed ends? NO - It's a golf ball.

 

So we can use questions to sort two objects. Can we do this with more objects?