If you have only ever seen white swans, is it possible a black swan exists?
We couldn’t possibly know for sure, but it would only take one black swan sighting to find out. (There is a book called Black Swan by Nicolas Taleb that dives into this theory).
I can’t help but wonder how many people wouldn’t recognize a black swan if they saw it.
All things are possible. If you want to be the one to see the black swan, you have to keep your eyes open to the possibility.