My wife Lalitha used to teach my daughter when she was in the UKG class.
One day she was teaching opposites.
Black-white / White-black / Black-white/ White-black / Black-white
This was going on for sometime.
I asked her what she was upto. She said that she is teaching opposites.
Is it not enough if you said Black-white?
Yes, but if they ask the opposite of white?
Black-white / White-black / Black-white .......
I was amused.