Ceiling paint

Someone told us there is a new ceiling paint that goes on blue, but later changes to white. 

We (we being me) asked "why"? 

We are told this is so you can see where you painted. 

We asked "why"? 

Because, this person said, that when you paint white paint over white paint it is hard to see where you have been, whereas, painting blue paint on white paint is easier to see. 

We said if you can't see the white paint you are painting over the white paint that was there before then it doesn't sound like you need to paint at all. Why not just save yourself the whole ordeal and just leave the original white paint "as is". 

They mumbled something about why we (we meaning me) don't have any friends.

©David L Arment