.

What shape of the swimming pool do you like

 

What if I pour all the water back to the ocean

 

From the swimming pool

 

What shape will the water looks like

 

Does it still remember that container before

 

Rectangle square circle ......

Rectangle square circle ......

Rectangle square circle ......

 

Container

 

What if I pour all the water back to the ocean

 

From the swimming pool

 

Empty container

 

Does it still can be called as a swimming pool