"It's impossible to bring the imagination to reality"

   Sure it is. You made pink leprechauns real in my imagination for
   just a moment for merely mentioning it.

   Do they exist where I can see them?

   Not yet but I can buy a statue of a leprechaun and paint it pink
   and say, "See, the imagined pink leprechauns of Steven Ward's
   imagination ARE in fact real!"

   Did they exist *before* I created the statue?
   Did they exist before you imagined them into existence?

   I have no idea. Hence: agnostic here.