The definition of 'opaque' (NB as an adjective) in the Collins English Dictionary is as follows:-
1. Not transmitting light; 2. Not reflecting light; 3. Not transmitting radiant energy (eg...
If you have to be opposite on opposite day, that makes it a day, and then there was no opposite day. But that can't be true since you HAVE to be opposite, which means that you have to be normal even...